可以调整gif动画图片尺寸的很实用的php类
-
demo
gif
php
使用
動畫
可以
圖片
尺寸
用的
的
類別
調整
类的使用demo：
<?<span php
</span><span //</span><span http://www.cnblogs.com/roucheng/</span>
<span require_once</span> "roucheng.php"<span ;
</span><span $gr</span> = <span new</span><span gifresizer;
</span><span $gr</span>->temp_dir = "keleyi"<span ;
</span><span $gr</span>->resize("keleyi.gif","keleyi_resized.gif",500,500<span );
</span>?>登入後複製
类的源代码,保存为roucheng.php文件：
<span 1</span> <?
<span 2</span> <span /*</span><span *
</span><span 3</span> <span *
</span><span 4</span> <span * Resizes Animated GIF Files
</span><span 5</span> <span *
</span><span 6</span> <span * ///IMPORTANT NOTE: The script needs a temporary directory where all the frames should be extracted.
</span><span 7</span> <span * Create a directory with a 777 permission level and write the path into $temp_dir variable below.
</span><span 8</span> <span *
</span><span 9</span> <span * Default directory is "frames".
</span><span 10</span> <span */</span>
<span 11</span>
<span 12</span> <span class</span><span gifresizer {
</span><span 13</span>
<span 14</span> <span public</span> <span $temp_dir</span> = "frames"<span ;
</span><span 15</span> <span private</span> <span $pointer</span> = 0<span ;
</span><span 16</span> <span private</span> <span $index</span> = 0<span ;
</span><span 17</span> <span private</span> <span $globaldata</span> = <span array</span><span ();
</span><span 18</span> <span private</span> <span $imagedata</span> = <span array</span><span ();
</span><span 19</span> <span private</span> <span $imageinfo</span> = <span array</span><span ();
</span><span 20</span> <span private</span> <span $handle</span> = 0<span ;
</span><span 21</span> <span private</span> <span $orgvars</span> = <span array</span><span ();
</span><span 22</span> <span private</span> <span $encdata</span> = <span array</span><span ();
</span><span 23</span> <span private</span> <span $parsedfiles</span> = <span array</span><span ();
</span><span 24</span> <span private</span> <span $originalwidth</span> = 0<span ;
</span><span 25</span> <span private</span> <span $originalheight</span> = 0<span ;
</span><span 26</span> <span private</span> <span $wr</span>,<span $hr</span><span ;
</span><span 27</span> <span private</span> <span $props</span> = <span array</span><span ();
</span><span 28</span> <span private</span> <span $decoding</span> = <span false</span><span ;
</span><span 29</span>
<span 30</span> <span /*</span><span *
</span><span 31</span> <span * Public part of the class
</span><span 32</span> <span *
</span><span 33</span> <span * @orgfile - Original file path
</span><span 34</span> <span * @newfile - New filename with path
</span><span 35</span> <span * @width - Desired image width
</span><span 36</span> <span * @height - Desired image height
</span><span 37</span> <span */</span>
<span 38</span> <span function</span> resize(<span $orgfile</span>,<span $newfile</span>,<span $width</span>,<span $height</span><span ){
</span><span 39</span> <span $this</span>->decode(<span $orgfile</span><span );
</span><span 40</span> <span $this</span>->wr=<span $width</span>/<span $this</span>-><span originalwidth;
</span><span 41</span> <span $this</span>->hr=<span $height</span>/<span $this</span>-><span originalheight;
</span><span 42</span> <span $this</span>-><span resizeframes();
</span><span 43</span> <span $this</span>->encode(<span $newfile</span>,<span $width</span>,<span $height</span><span );
</span><span 44</span> <span $this</span>-><span clearframes();
</span><span 45</span> <span }
</span><span 46</span>
<span 47</span> <span /*</span><span *
</span><span 48</span> <span * GIF Decoder function.
</span><span 49</span> <span * Parses the GIF animation into single frames.
</span><span 50</span> <span */</span>
<span 51</span> <span private</span> <span function</span> decode(<span $filename</span><span ){
</span><span 52</span> <span $this</span>->decoding = <span true</span><span ;
</span><span 53</span> <span $this</span>-><span clearvariables();
</span><span 54</span> <span $this</span>->loadfile(<span $filename</span><span );
</span><span 55</span> <span $this</span>-><span get_gif_header();
</span><span 56</span> <span $this</span>->get_graphics_extension(0<span );
</span><span 57</span> <span $this</span>-><span get_application_data();
</span><span 58</span> <span $this</span>-><span get_application_data();
</span><span 59</span> <span $this</span>->get_image_block(0<span );
</span><span 60</span> <span $this</span>->get_graphics_extension(1<span );
</span><span 61</span> <span $this</span>-><span get_comment_data();
</span><span 62</span> <span $this</span>-><span get_application_data();
</span><span 63</span> <span $this</span>->get_image_block(1<span );
</span><span 64</span> <span while</span>(!<span $this</span>->checkbyte(0x3b) && !<span $this</span>-><span checkEOF()){
</span><span 65</span> <span $this</span>->get_comment_data(1<span );
</span><span 66</span> <span $this</span>->get_graphics_extension(2<span );
</span><span 67</span> <span $this</span>->get_image_block(2<span );
</span><span 68</span> <span }
</span><span 69</span> <span $this</span>->writeframes(<span time</span><span ());
</span><span 70</span> <span $this</span>-><span closefile();
</span><span 71</span> <span $this</span>->decoding = <span false</span><span ;
</span><span 72</span> <span }
</span><span 73</span>
<span 74</span> <span /*</span><span *
</span><span 75</span> <span * GIF Encoder function.
</span><span 76</span> <span * Combines the parsed GIF frames into one single animation.
</span><span 77</span> <span */</span>
<span 78</span> <span private</span> <span function</span> encode(<span $new_filename</span>,<span $newwidth</span>,<span $newheight</span><span ){
</span><span 79</span> <span $mystring</span> = ""<span ;
</span><span 80</span> <span $this</span>->pointer = 0<span ;
</span><span 81</span> <span $this</span>->imagedata = <span array</span><span ();
</span><span 82</span> <span $this</span>->imageinfo = <span array</span><span ();
</span><span 83</span> <span $this</span>->handle = 0<span ;
</span><span 84</span> <span $this</span>->index=0<span ;
</span><span 85</span>
<span 86</span> <span $k</span>=0<span ;
</span><span 87</span> <span foreach</span>(<span $this</span>->parsedfiles <span as</span> <span $imagepart</span><span ){
</span><span 88</span> <span $this</span>->loadfile(<span $imagepart</span><span );
</span><span 89</span> <span $this</span>-><span get_gif_header();
</span><span 90</span> <span $this</span>-><span get_application_data();
</span><span 91</span> <span $this</span>-><span get_comment_data();
</span><span 92</span> <span $this</span>->get_graphics_extension(0<span );
</span><span 93</span> <span $this</span>->get_image_block(0<span );
</span><span 94</span>
<span 95</span> <span //</span><span get transparent color index and color</span>
<span 96</span> <span if</span>(<span isset</span>(<span $this</span>->encdata[<span $this</span>->index-1<span ]))
</span><span 97</span> <span $gxdata</span> = <span $this</span>->encdata[<span $this</span>->index-1]["graphicsextension"<span ];
</span><span 98</span> <span else</span>
<span 99</span> <span $gxdata</span> = <span null</span><span ;
</span><span 100</span> <span $ghdata</span> = <span $this</span>->imageinfo["gifheader"<span ];
</span><span 101</span> <span $trcolor</span> = ""<span ;
</span><span 102</span> <span $hastransparency</span>=(<span $gxdata</span>[3]&&1==1<span );
</span><span 103</span>
<span 104</span> <span if</span>(<span $hastransparency</span><span ){
</span><span 105</span> <span $trcx</span> = <span ord</span>(<span $gxdata</span>[6<span ]);
</span><span 106</span> <span $trcolor</span> = <span substr</span>(<span $ghdata</span>,13+<span $trcx</span>*3,3<span );
</span><span 107</span> <span }
</span><span 108</span>
<span 109</span> <span //</span><span global color table to image data;</span>
<span 110</span> <span $this</span>->transfercolortable(<span $this</span>->imageinfo["gifheader"],<span $this</span>->imagedata[<span $this</span>->index-1]["imagedata"<span ]);
</span><span 111</span>
<span 112</span> <span $imageblock</span> = &<span $this</span>->imagedata[<span $this</span>->index-1]["imagedata"<span ];
</span><span 113</span>
<span 114</span> <span //</span><span if transparency exists transfer transparency index</span>
<span 115</span> <span if</span>(<span $hastransparency</span><span ){
</span><span 116</span> <span $haslocalcolortable</span> = ((<span ord</span>(<span $imageblock</span>[9])&128)==128<span );
</span><span 117</span> <span if</span>(<span $haslocalcolortable</span><span ){
</span><span 118</span> <span //</span><span local table exists. determine boundaries and look for it.</span>
<span 119</span> <span $tablesize</span>=(<span pow</span>(2,(<span ord</span>(<span $imageblock</span>[9])&7)+1)*3)+10<span ;
</span><span 120</span> <span $this</span>->orgvars[<span $this</span>->index-1]["transparent_color_index"] =
<span 121</span> ((<span strrpos</span>(<span substr</span>(<span $this</span>->imagedata[<span $this</span>->index-1]["imagedata"],0,<span $tablesize</span>),<span $trcolor</span>)-10)/3<span );
</span><span 122</span> }<span else</span><span {
</span><span 123</span> <span //</span><span local table doesnt exist, look at the global one.</span>
<span 124</span> <span $tablesize</span>=(<span pow</span>(2,(<span ord</span>(<span $gxdata</span>[10])&7)+1)*3)+10<span ;
</span><span 125</span> <span $this</span>->orgvars[<span $this</span>->index-1]["transparent_color_index"] =
<span 126</span> ((<span strrpos</span>(<span substr</span>(<span $ghdata</span>,0,<span $tablesize</span>),<span $trcolor</span>)-10)/3<span );
</span><span 127</span> <span }
</span><span 128</span> <span }
</span><span 129</span>
<span 130</span> <span //</span><span apply original delay time,transparent index and disposal values to graphics extension</span>
<span 131</span>
<span 132</span> <span if</span>(!<span $this</span>->imagedata[<span $this</span>->index-1]["graphicsextension"]) <span $this</span>->imagedata[<span $this</span>->index-1]["graphicsextension"] = <span chr</span>(0x21).<span chr</span>(0xf9).<span chr</span>(0x04).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00<span );
</span><span 133</span>
<span 134</span> <span $imagedata</span> = &<span $this</span>->imagedata[<span $this</span>->index-1]["graphicsextension"<span ];
</span><span 135</span>
<span 136</span> <span $imagedata</span>[3] = <span chr</span>((<span ord</span>(<span $imagedata</span>[3]) & 0xE3) | (<span $this</span>->orgvars[<span $this</span>->index-1]["disposal_method"] << 2<span ));
</span><span 137</span> <span $imagedata</span>[4] = <span chr</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["delay_time"] % 256<span ));
</span><span 138</span> <span $imagedata</span>[5] = <span chr</span>(<span floor</span>(<span $this</span>->orgvars[<span $this</span>->index-1]["delay_time"] / 256<span ));
</span><span 139</span> <span if</span>(<span $hastransparency</span><span ){
</span><span 140</span> <span $imagedata</span>[6] = <span chr</span>(<span $this</span>->orgvars[<span $this</span>->index-1]["transparent_color_index"<span ]);
</span><span 141</span> <span }
</span><span 142</span> <span $imagedata</span>[3] = <span chr</span>(<span ord</span>(<span $imagedata</span>[3])|<span $hastransparency</span><span );
</span><span 143</span>
<span 144</span> <span //</span><span apply calculated left and top offset </span>
<span 145</span> <span $imageblock</span>[1] = <span chr</span>(<span round</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_left"]*<span $this</span>->wr) % 256<span ));
</span><span 146</span> <span $imageblock</span>[2] = <span chr</span>(<span floor</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_left"]*<span $this</span>->wr) / 256<span ));
</span><span 147</span> <span $imageblock</span>[3] = <span chr</span>(<span round</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_top"]*<span $this</span>->hr) % 256<span ));
</span><span 148</span> <span $imageblock</span>[4] = <span chr</span>(<span floor</span>((<span $this</span>->orgvars[<span $this</span>->index-1]["offset_top"]*<span $this</span>->hr) / 256<span ));
</span><span 149</span>
<span 150</span> <span if</span>(<span $this</span>->index==1<span ){
</span><span 151</span> <span if</span>(!<span isset</span>(<span $this</span>->imageinfo["applicationdata"]) || !<span $this</span>->imageinfo["applicationdata"<span ])
</span><span 152</span> <span $this</span>->imageinfo["applicationdata"]=<span chr</span>(0x21).<span chr</span>(0xff).<span chr</span>(0x0b)."NETSCAPE2.0".<span chr</span>(0x03).<span chr</span>(0x01).<span chr</span>(0x00).<span chr</span>(0x00).<span chr</span>(0x00<span );
</span><span 153</span> <span if</span>(!<span isset</span>(<span $this</span>->imageinfo["commentdata"]) || !<span $this</span>->imageinfo["commentdata"<span ])
</span><span 154</span> <span $this</span>->imageinfo["commentdata"] = <span chr</span>(0x21).<span chr</span>(0xfe).<span chr</span>(0x10)."PHPGIFRESIZER1.0".<span chr</span>(0<span );
</span><span 155</span> <span $mystring</span> .= <span $this</span>->orgvars["gifheader"]. <span $this</span>->imageinfo["applicationdata"].<span $this</span>->imageinfo["commentdata"<span ];
</span><span 156</span> <span if</span>(<span isset</span>(<span $this</span>->orgvars["hasgx_type_0"]) && <span $this</span>->orgvars["hasgx_type_0"]) <span $mystring</span> .= <span $this</span>->globaldata["graphicsextension_0"<span ];
</span><span 157</span> <span if</span>(<span isset</span>(<span $this</span>->orgvars["hasgx_type_1"]) && <span $this</span>->orgvars["hasgx_type_1"]) <span $mystring</span> .= <span $this</span>->globaldata["graphicsextension"<span ];
</span><span 158</span> <span }
</span><span 159</span>
<span 160</span> <span $mystring</span> .= <span $imagedata</span> . <span $imageblock</span><span ;
</span><span 161</span> <span $k</span>++<span ;
</span><span 162</span> <span $this</span>-><span closefile();
</span><span 163</span> <span }
</span><span 164</span>
<span 165</span> <span $mystring</span> .= <span chr</span>(0x3b<span );
</span><span 166</span>
<span 167</span> <span //</span><span applying new width & height to gif header</span>
<span 168</span> <span $mystring</span>[6] = <span chr</span>(<span $newwidth</span> % 256<span );
</span><span 169</span> <span $mystring</span>[7] = <span chr</span>(<span floor</span>(<span $newwidth</span> / 256<span ));
</span><span 170</span> <span $mystring</span>[8] = <span chr</span>(<span $newheight</span> % 256<span );
</span><span 171</span> <span $mystring</span>[9] = <span chr</span>(<span floor</span>(<span $newheight</span> / 256<span ));
</span><span 172</span> <span $mystring</span>[11]= <span $this</span>->orgvars["background_color"<span ];
</span><span 173</span> <span //</span><span if(file_exists($new_filename)){unlink($new_filename);}</span>
<span 174</span> <span file_put_contents</span>(<span $new_filename</span>,<span $mystring</span><span );
</span><span 175</span> <span }
</span><span 176</span>
<span 177</span> <span /*</span><span *
</span><span 178</span> <span * Variable Reset function
</span><span 179</span> <span * If a instance is used multiple times, it's needed. Trust me.
</span><span 180</span> <span */</span>
<span 181</span> <span private</span> <span function</span><span clearvariables(){
</span><span 182</span> <span $this</span>->pointer = 0<span ;
</span><span 183</span> <span $this</span>->index = 0<span ;
</span><span 184</span> <span $this</span>->imagedata = <span array</span><span ();
</span><span 185</span> <span $this</span>->imageinfo = <span array</span><span ();
</span><span 186</span> <span $this</span>->handle = 0<span ;
</span><span 187</span> <span $this</span>->parsedfiles = <span array</span><span ();
</span><span 188</span> <span }
</span><span 189</span>
<span 190</span> <span /*</span><span *
</span><span 191</span> <span * Clear Frames function
</span><span 192</span> <span * For deleting the frames after encoding.
</span><span 193</span> <span */</span>
<span 194</span> <span private</span> <span function</span><span clearframes(){
</span><span 195</span> <span foreach</span>(<span $this</span>->parsedfiles <span as</span> <span $temp_frame</span><span ){
</span><span 196</span> <span unlink</span>(<span $temp_frame</span><span );
</span><span 197</span> <span }
</span><span 198</span> <span }
</span><span 199</span>
<span 200</span> <span /*</span><span *
</span><span 201</span> <span * Frame Writer
</span><span 202</span> <span * Writes the GIF frames into files.
</span><span 203</span> <span */</span>
<span 204</span> <span private</span> <span function</span> writeframes(<span $prepend</span><span ){
</span><span 205</span> <span for</span>(<span $i</span>=0;<span $i</span><<span sizeof</span>(<span $this</span>->imagedata);<span $i</span>++<span ){
</span><span 206</span> <span file_put_contents</span>(<span $this</span>->temp_dir."/frame_".<span $prepend</span>."_".<span str_pad</span>(<span $i</span>,2,"0",STR_PAD_LEFT).".gif",<span $this</span>->imageinfo["gifheader"].<span $this</span>->imagedata[<span $i</span>]["graphicsextension"].<span $this</span>->imagedata[<span $i</span>]["imagedata"].<span chr</span>(0x3b<span ));
</span><span 207</span> <span $this</span>->parsedfiles[]=<span $this</span>->temp_dir."/frame_".<span $prepend</span>."_".<span str_pad</span>(<span $i</span>,2,"0",STR_PAD_LEFT).".gif"<span ;
</span><span 208</span> <span }
</span><span 209</span> <span }
</span><span 210</span>
<span 211</span> <span /*</span><span *
</span><span 212</span> <span * Color Palette Transfer Device
</span><span 213</span> <span * Transferring Global Color Table (GCT) from frames into Local Color Tables in animation.
</span><span 214</span> <span */</span>
<span 215</span> <span private</span> <span function</span> transfercolortable(<span $src</span>,&<span $dst</span><span ){
</span><span 216</span> <span //</span><span src is gif header,dst is image data block
</span><span 217</span> <span //if global color table exists,transfer it</span>
<span 218</span> <span if</span>((<span ord</span>(<span $src</span>[10])&128)==128<span ){
</span><span 219</span> <span //</span><span Gif Header Global Color Table Length</span>
<span 220</span> <span $ghctl</span> = <span pow</span>(2,<span $this</span>->readbits(<span ord</span>(<span $src</span>[10]),5,3)+1)*3<span ;
</span><span 221</span> <span //</span><span cut global color table from gif header</span>
<span 222</span> <span $ghgct</span> = <span substr</span>(<span $src</span>,13,<span $ghctl</span><span );
</span><span 223</span> <span //</span><span check image block color table length</span>
<span 224</span> <span if</span>((<span ord</span>(<span $dst</span>[9])&128)==128<span ){
</span><span 225</span> <span //</span><span Image data contains color table. skip.</span>
<span 226</span> }<span else</span><span {
</span><span 227</span> <span //</span><span Image data needs a color table.
</span><span 228</span> <span //get last color table length so we can truncate the dummy color table</span>
<span 229</span> <span $idctl</span> = <span pow</span>(2,<span $this</span>->readbits(<span ord</span>(<span $dst</span>[9]),5,3)+1)*3<span ;
</span><span 230</span> <span //</span><span set color table flag and length </span>
<span 231</span> <span $dst</span>[9] = <span chr</span>(<span ord</span>(<span $dst</span>[9]) | (0x80 | (<span log</span>(<span $ghctl</span>/3,2)-1<span )));
</span><span 232</span> <span //</span><span inject color table</span>
<span 233</span> <span $dst</span> = <span substr</span>(<span $dst</span>,0,10).<span $ghgct</span>.<span substr</span>(<span $dst</span>,-1*<span strlen</span>(<span $dst</span>)+10<span );
</span><span 234</span> <span }
</span><span 235</span> }<span else</span><span {
</span><span 236</span> <span //</span><span global color table doesn't exist. skip.</span>
<span 237</span> <span }
</span><span 238</span> <span }
</span><span 239</span>
<span 240</span> <span /*</span><span *
</span><span 241</span> <span * GIF Parser Functions.
</span><span 242</span> <span * Below functions are the main structure parser components.
</span><span 243</span> <span */</span>
<span 244</span> <span private</span> <span function</span><span get_gif_header(){
</span><span 245</span> <span $this</span>->p_forward(10<span );
</span><span 246</span> <span if</span>(<span $this</span>->readbits((<span $mybyte</span>=<span $this</span>->readbyte_int()),0,1)==1<span ){
</span><span 247</span> <span $this</span>->p_forward(2<span );
</span><span 248</span> <span $this</span>->p_forward(<span pow</span>(2,<span $this</span>->readbits(<span $mybyte</span>,5,3)+1)*3<span );
</span><span 249</span> }<span else</span><span {
</span><span 250</span> <span $this</span>->p_forward(2<span );
</span><span 251</span> <span }
</span><span 252</span>
<span 253</span> <span $this</span>->imageinfo["gifheader"]=<span $this</span>->datapart(0,<span $this</span>-><span pointer);
</span><span 254</span> <span if</span>(<span $this</span>-><span decoding){
</span><span 255</span> <span $this</span>->orgvars["gifheader"]=<span $this</span>->imageinfo["gifheader"<span ];
</span><span 256</span> <span $this</span>->originalwidth = <span ord</span>(<span $this</span>->orgvars["gifheader"][7])*256+<span ord</span>(<span $this</span>->orgvars["gifheader"][6<span ]);
</span><span 257</span> <span $this</span>->originalheight = <span ord</span>(<span $this</span>->orgvars["gifheader"][9])*256+<span ord</span>(<span $this</span>->orgvars["gifheader"][8<span ]);
</span><span 258</span> <span $this</span>->orgvars["background_color"]=<span $this</span>->orgvars["gifheader"][11<span ];
</span><span 259</span> <span }
</span><span 260</span>
<span 261</span> <span }
</span><span 262</span> <span //</span><span -------------------------------------------------------</span>
<span 263</span> <span private</span> <span function</span><span get_application_data(){
</span><span 264</span> <span $startdata</span> = <span $this</span>->readbyte(2<span );
</span><span 265</span> <span if</span>(<span $startdata</span>==<span chr</span>(0x21).<span chr</span>(0xff<span )){
</span><span 266</span> <span $start</span> = <span $this</span>->pointer - 2<span ;
</span><span 267</span> <span $this</span>->p_forward(<span $this</span>-><span readbyte_int());
</span><span 268</span> <span $this</span>->read_data_stream(<span $this</span>-><span readbyte_int());
</span><span 269</span> <span $this</span>->imageinfo["applicationdata"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 270</span> }<span else</span><span {
</span><span 271</span> <span $this</span>->p_rewind(2<span );
</span><span 272</span> <span }
</span><span 273</span> <span }
</span><span 274</span> <span //</span><span -------------------------------------------------------</span>
<span 275</span> <span private</span> <span function</span><span get_comment_data(){
</span><span 276</span> <span $startdata</span> = <span $this</span>->readbyte(2<span );
</span><span 277</span> <span if</span>(<span $startdata</span>==<span chr</span>(0x21).<span chr</span>(0xfe<span )){
</span><span 278</span> <span $start</span> = <span $this</span>->pointer - 2<span ;
</span><span 279</span> <span $this</span>->read_data_stream(<span $this</span>-><span readbyte_int());
</span><span 280</span> <span $this</span>->imageinfo["commentdata"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 281</span> }<span else</span><span {
</span><span 282</span> <span $this</span>->p_rewind(2<span );
</span><span 283</span> <span }
</span><span 284</span> <span }
</span><span 285</span> <span //</span><span -------------------------------------------------------</span>
<span 286</span> <span private</span> <span function</span> get_graphics_extension(<span $type</span><span ){
</span><span 287</span> <span $startdata</span> = <span $this</span>->readbyte(2<span );
</span><span 288</span> <span if</span>(<span $startdata</span>==<span chr</span>(0x21).<span chr</span>(0xf9<span )){
</span><span 289</span> <span $start</span> = <span $this</span>->pointer - 2<span ;
</span><span 290</span> <span $this</span>->p_forward(<span $this</span>-><span readbyte_int());
</span><span 291</span> <span $this</span>->p_forward(1<span );
</span><span 292</span> <span if</span>(<span $type</span>==2<span ){
</span><span 293</span> <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 294</span> }<span else</span> <span if</span>(<span $type</span>==1<span ){
</span><span 295</span> <span $this</span>->orgvars["hasgx_type_1"] = 1<span ;
</span><span 296</span> <span $this</span>->globaldata["graphicsextension"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 297</span> }<span else</span> <span if</span>(<span $type</span>==0 && <span $this</span>->decoding==<span false</span><span ){
</span><span 298</span> <span $this</span>->encdata[<span $this</span>->index]["graphicsextension"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 299</span> }<span else</span> <span if</span>(<span $type</span>==0 && <span $this</span>->decoding==<span true</span><span ){
</span><span 300</span> <span $this</span>->orgvars["hasgx_type_0"] = 1<span ;
</span><span 301</span> <span $this</span>->globaldata["graphicsextension_0"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 302</span> <span }
</span><span 303</span> }<span else</span><span {
</span><span 304</span> <span $this</span>->p_rewind(2<span );
</span><span 305</span> <span }
</span><span 306</span> <span }
</span><span 307</span> <span //</span><span -------------------------------------------------------</span>
<span 308</span> <span private</span> <span function</span> get_image_block(<span $type</span><span ){
</span><span 309</span> <span if</span>(<span $this</span>->checkbyte(0x2c<span )){
</span><span 310</span> <span $start</span> = <span $this</span>-><span pointer;
</span><span 311</span> <span $this</span>->p_forward(9<span );
</span><span 312</span> <span if</span>(<span $this</span>->readbits((<span $mybyte</span>=<span $this</span>->readbyte_int()),0,1)==1<span ){
</span><span 313</span> <span $this</span>->p_forward(<span pow</span>(2,<span $this</span>->readbits(<span $mybyte</span>,5,3)+1)*3<span );
</span><span 314</span> <span }
</span><span 315</span> <span $this</span>->p_forward(1<span );
</span><span 316</span> <span $this</span>->read_data_stream(<span $this</span>-><span readbyte_int());
</span><span 317</span> <span $this</span>->imagedata[<span $this</span>->index]["imagedata"] = <span $this</span>->datapart(<span $start</span>,<span $this</span>->pointer-<span $start</span><span );
</span><span 318</span>
<span 319</span> <span if</span>(<span $type</span>==0<span ){
</span><span 320</span> <span $this</span>->orgvars["hasgx_type_0"] = 0<span ;
</span><span 321</span> <span if</span>(<span isset</span>(<span $this</span>->globaldata["graphicsextension_0"<span ]))
</span><span 322</span> <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span $this</span>->globaldata["graphicsextension_0"<span ];
</span><span 323</span> <span else</span>
<span 324</span> <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span null</span><span ;
</span><span 325</span> <span unset</span>(<span $this</span>->globaldata["graphicsextension_0"<span ]);
</span><span 326</span> }<span elseif</span>(<span $type</span>==1<span ){
</span><span 327</span> <span if</span>(<span isset</span>(<span $this</span>->orgvars["hasgx_type_1"]) && <span $this</span>->orgvars["hasgx_type_1"]==1<span ){
</span><span 328</span> <span $this</span>->orgvars["hasgx_type_1"] = 0<span ;
</span><span 329</span> <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span $this</span>->globaldata["graphicsextension"<span ];
</span><span 330</span> <span unset</span>(<span $this</span>->globaldata["graphicsextension"<span ]);
</span><span 331</span> }<span else</span><span {
</span><span 332</span> <span $this</span>->orgvars["hasgx_type_0"] = 0<span ;
</span><span 333</span> <span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"]=<span $this</span>->globaldata["graphicsextension_0"<span ];
</span><span 334</span> <span unset</span>(<span $this</span>->globaldata["graphicsextension_0"<span ]);
</span><span 335</span> <span }
</span><span 336</span> <span }
</span><span 337</span>
<span 338</span> <span $this</span>-><span parse_image_data();
</span><span 339</span> <span $this</span>->index++<span ;
</span><span 340</span>
<span 341</span> <span }
</span><span 342</span> <span }
</span><span 343</span> <span //</span><span -------------------------------------------------------</span>
<span 344</span> <span private</span> <span function</span><span parse_image_data(){
</span><span 345</span> <span $this</span>->imagedata[<span $this</span>->index]["disposal_method"] = <span $this</span>->get_imagedata_bit("ext",3,3,3<span );
</span><span 346</span> <span $this</span>->imagedata[<span $this</span>->index]["user_input_flag"] = <span $this</span>->get_imagedata_bit("ext",3,6,1<span );
</span><span 347</span> <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_flag"] = <span $this</span>->get_imagedata_bit("ext",3,7,1<span );
</span><span 348</span> <span $this</span>->imagedata[<span $this</span>->index]["delay_time"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("ext",4,2<span ));
</span><span 349</span> <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_index"] = <span ord</span>(<span $this</span>->get_imagedata_byte("ext",6,1<span ));
</span><span 350</span> <span $this</span>->imagedata[<span $this</span>->index]["offset_left"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",1,2<span ));
</span><span 351</span> <span $this</span>->imagedata[<span $this</span>->index]["offset_top"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",3,2<span ));
</span><span 352</span> <span $this</span>->imagedata[<span $this</span>->index]["width"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",5,2<span ));
</span><span 353</span> <span $this</span>->imagedata[<span $this</span>->index]["height"] = <span $this</span>->dualbyteval(<span $this</span>->get_imagedata_byte("dat",7,2<span ));
</span><span 354</span> <span $this</span>->imagedata[<span $this</span>->index]["local_color_table_flag"] = <span $this</span>->get_imagedata_bit("dat",9,0,1<span );
</span><span 355</span> <span $this</span>->imagedata[<span $this</span>->index]["interlace_flag"] = <span $this</span>->get_imagedata_bit("dat",9,1,1<span );
</span><span 356</span> <span $this</span>->imagedata[<span $this</span>->index]["sort_flag"] = <span $this</span>->get_imagedata_bit("dat",9,2,1<span );
</span><span 357</span> <span $this</span>->imagedata[<span $this</span>->index]["color_table_size"] = <span pow</span>(2,<span $this</span>->get_imagedata_bit("dat",9,5,3)+1)*3<span ;
</span><span 358</span> <span $this</span>->imagedata[<span $this</span>->index]["color_table"] = <span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["imagedata"],10,<span $this</span>->imagedata[<span $this</span>->index]["color_table_size"<span ]);
</span><span 359</span> <span $this</span>->imagedata[<span $this</span>->index]["lzw_code_size"] = <span ord</span>(<span $this</span>->get_imagedata_byte("dat",10,1<span ));
</span><span 360</span> <span if</span>(<span $this</span>-><span decoding){
</span><span 361</span> <span $this</span>->orgvars[<span $this</span>->index]["transparent_color_flag"] = <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_flag"<span ];
</span><span 362</span> <span $this</span>->orgvars[<span $this</span>->index]["transparent_color_index"] = <span $this</span>->imagedata[<span $this</span>->index]["transparent_color_index"<span ];
</span><span 363</span> <span $this</span>->orgvars[<span $this</span>->index]["delay_time"] = <span $this</span>->imagedata[<span $this</span>->index]["delay_time"<span ];
</span><span 364</span> <span $this</span>->orgvars[<span $this</span>->index]["disposal_method"] = <span $this</span>->imagedata[<span $this</span>->index]["disposal_method"<span ];
</span><span 365</span> <span $this</span>->orgvars[<span $this</span>->index]["offset_left"] = <span $this</span>->imagedata[<span $this</span>->index]["offset_left"<span ];
</span><span 366</span> <span $this</span>->orgvars[<span $this</span>->index]["offset_top"] = <span $this</span>->imagedata[<span $this</span>->index]["offset_top"<span ];
</span><span 367</span> <span }
</span><span 368</span> <span }
</span><span 369</span> <span //</span><span -------------------------------------------------------</span>
<span 370</span> <span private</span> <span function</span> get_imagedata_byte(<span $type</span>,<span $start</span>,<span $length</span><span ){
</span><span 371</span> <span if</span>(<span $type</span>=="ext"<span )
</span><span 372</span> <span return</span> <span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"],<span $start</span>,<span $length</span><span );
</span><span 373</span> <span elseif</span>(<span $type</span>=="dat"<span )
</span><span 374</span> <span return</span> <span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["imagedata"],<span $start</span>,<span $length</span><span );
</span><span 375</span> <span }
</span><span 376</span> <span //</span><span -------------------------------------------------------</span>
<span 377</span> <span private</span> <span function</span> get_imagedata_bit(<span $type</span>,<span $byteindex</span>,<span $bitstart</span>,<span $bitlength</span><span ){
</span><span 378</span> <span if</span>(<span $type</span>=="ext"<span )
</span><span 379</span> <span return</span> <span $this</span>->readbits(<span ord</span>(<span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["graphicsextension"],<span $byteindex</span>,1)),<span $bitstart</span>,<span $bitlength</span><span );
</span><span 380</span> <span elseif</span>(<span $type</span>=="dat"<span )
</span><span 381</span> <span return</span> <span $this</span>->readbits(<span ord</span>(<span substr</span>(<span $this</span>->imagedata[<span $this</span>->index]["imagedata"],<span $byteindex</span>,1)),<span $bitstart</span>,<span $bitlength</span><span );
</span><span 382</span> <span }
</span><span 383</span> <span //</span><span -------------------------------------------------------</span>
<span 384</span> <span private</span> <span function</span> dualbyteval(<span $s</span><span ){
</span><span 385</span> <span $i</span> = <span ord</span>(<span $s</span>[1])*256 + <span ord</span>(<span $s</span>[0<span ]);
</span><span 386</span> <span return</span> <span $i</span><span ;
</span><span 387</span> <span }
</span><span 388</span> <span //</span><span ------------ Helper Functions ---------------------</span>
<span 389</span> <span private</span> <span function</span> read_data_stream(<span $first_length</span><span ){
</span><span 390</span> <span $this</span>->p_forward(<span $first_length</span><span );
</span><span 391</span> <span $length</span>=<span $this</span>-><span readbyte_int();
</span><span 392</span> <span if</span>(<span $length</span>!=0<span ) {
</span><span 393</span> <span while</span>(<span $length</span>!=0<span ){
</span><span 394</span> <span $this</span>->p_forward(<span $length</span><span );
</span><span 395</span> <span $length</span>=<span $this</span>-><span readbyte_int();
</span><span 396</span> <span }
</span><span 397</span> <span }
</span><span 398</span> <span return</span> <span true</span><span ;
</span><span 399</span> <span }
</span><span 400</span> <span //</span><span -------------------------------------------------------</span>
<span 401</span> <span private</span> <span function</span> loadfile(<span $filename</span><span ){
</span><span 402</span> <span $this</span>->handle = <span fopen</span>(<span $filename</span>,"rb"<span );
</span><span 403</span> <span $this</span>->pointer = 0<span ;
</span><span 404</span> <span }
</span><span 405</span> <span //</span><span -------------------------------------------------------</span>
<span 406</span> <span private</span> <span function</span><span closefile(){
</span><span 407</span> <span fclose</span>(<span $this</span>-><span handle);
</span><span 408</span> <span $this</span>->handle=0<span ;
</span><span 409</span> <span }
</span><span 410</span> <span //</span><span -------------------------------------------------------</span>
<span 411</span> <span private</span> <span function</span> readbyte(<span $byte_count</span><span ){
</span><span 412</span> <span $data</span> = <span fread</span>(<span $this</span>->handle,<span $byte_count</span><span );
</span><span 413</span> <span $this</span>->pointer += <span $byte_count</span><span ;
</span><span 414</span> <span return</span> <span $data</span><span ;
</span><span 415</span> <span }
</span><span 416</span> <span //</span><span -------------------------------------------------------</span>
<span 417</span> <span private</span> <span function</span><span readbyte_int(){
</span><span 418</span> <span $data</span> = <span fread</span>(<span $this</span>->handle,1<span );
</span><span 419</span> <span $this</span>->pointer++<span ;
</span><span 420</span> <span return</span> <span ord</span>(<span $data</span><span );
</span><span 421</span> <span }
</span><span 422</span> <span //</span><span -------------------------------------------------------</span>
<span 423</span> <span private</span> <span function</span> readbits(<span $byte</span>,<span $start</span>,<span $length</span><span ){
</span><span 424</span> <span $bin</span> = <span str_pad</span>(<span decbin</span>(<span $byte</span>),8,"0",<span STR_PAD_LEFT);
</span><span 425</span> <span $data</span> = <span substr</span>(<span $bin</span>,<span $start</span>,<span $length</span><span );
</span><span 426</span> <span return</span> <span bindec</span>(<span $data</span><span );
</span><span 427</span> <span }
</span><span 428</span> <span //</span><span -------------------------------------------------------</span>
<span 429</span> <span private</span> <span function</span> p_rewind(<span $length</span><span ){
</span><span 430</span> <span $this</span>->pointer-=<span $length</span><span ;
</span><span 431</span> <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 432</span> <span }
</span><span 433</span> <span //</span><span -------------------------------------------------------</span>
<span 434</span> <span private</span> <span function</span> p_forward(<span $length</span><span ){
</span><span 435</span> <span $this</span>->pointer+=<span $length</span><span ;
</span><span 436</span> <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 437</span> <span }
</span><span 438</span> <span //</span><span -------------------------------------------------------</span>
<span 439</span> <span private</span> <span function</span> datapart(<span $start</span>,<span $length</span><span ){
</span><span 440</span> <span fseek</span>(<span $this</span>->handle,<span $start</span><span );
</span><span 441</span> <span $data</span> = <span fread</span>(<span $this</span>->handle,<span $length</span><span );
</span><span 442</span> <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 443</span> <span return</span> <span $data</span><span ;
</span><span 444</span> <span }
</span><span 445</span> <span //</span><span -------------------------------------------------------</span>
<span 446</span> <span private</span> <span function</span> checkbyte(<span $byte</span><span ){
</span><span 447</span> <span if</span>(<span fgetc</span>(<span $this</span>->handle)==<span chr</span>(<span $byte</span><span )){
</span><span 448</span> <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 449</span> <span return</span> <span true</span><span ;
</span><span 450</span> }<span else</span><span {
</span><span 451</span> <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 452</span> <span return</span> <span false</span><span ;
</span><span 453</span> <span }
</span><span 454</span> <span }
</span><span 455</span> <span //</span><span -------------------------------------------------------</span>
<span 456</span> <span private</span> <span function</span><span checkEOF(){
</span><span 457</span> <span if</span>(<span fgetc</span>(<span $this</span>->handle)===<span false</span><span ){
</span><span 458</span> <span return</span> <span true</span><span ;
</span><span 459</span> }<span else</span><span {
</span><span 460</span> <span fseek</span>(<span $this</span>->handle,<span $this</span>-><span pointer);
</span><span 461</span> <span return</span> <span false</span><span ;
</span><span 462</span> <span }
</span><span 463</span> <span }
</span><span 464</span> <span //</span><span -------------------------------------------------------</span>
<span 465</span> <span /*</span><span *
</span><span 466</span> <span * Debug Functions. keleyi.com
</span><span 467</span> <span * Parses the GIF animation into single frames.
</span><span 468</span> <span */</span>
<span 469</span> <span private</span> <span function</span> debug(<span $string</span><span ){
</span><span 470</span> <span echo</span> "<pre class="brush:php;toolbar:false">"<span ;
</span><span 471</span> <span for</span>(<span $i</span>=0;<span $i</span><<span strlen</span>(<span $string</span>);<span $i</span>++<span ){
</span><span 472</span> <span echo</span> <span str_pad</span>(<span dechex</span>(<span ord</span>(<span $string</span>[<span $i</span>])),2,"0",STR_PAD_LEFT). " "<span ;
</span><span 473</span> <span }
</span><span 474</span> <span echo</span> "登入後複製
"<span ;
</span><span 479</span> <span for</span>(<span $i</span>=0;<span $i</span><<span $len</span>;<span $i</span>++<span ){
</span><span 480</span> <span echo</span> <span str_pad</span>(<span dechex</span>(<span ord</span>(<span $var</span>[<span $i</span>])),2,"0",STR_PAD_LEFT). " "<span ;
</span><span 481</span> <span }
</span><span 482</span> <span echo</span> "登入後複製
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強大的PHP整合開發環境
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在PHP API中說明JSON Web令牌（JWT）及其用例。
Apr 05, 2025 am 12:04 AM
JWT是一種基於JSON的開放標準，用於在各方之間安全地傳輸信息，主要用於身份驗證和信息交換。 1.JWT由Header、Payload和Signature三部分組成。 2.JWT的工作原理包括生成JWT、驗證JWT和解析Payload三個步驟。 3.在PHP中使用JWT進行身份驗證時，可以生成和驗證JWT，並在高級用法中包含用戶角色和權限信息。 4.常見錯誤包括簽名驗證失敗、令牌過期和Payload過大，調試技巧包括使用調試工具和日誌記錄。 5.性能優化和最佳實踐包括使用合適的簽名算法、合理設置有效期、
解釋PHP中的晚期靜態綁定（靜態：:)。
Apr 03, 2025 am 12:04 AM
靜態綁定（static::）在PHP中實現晚期靜態綁定（LSB），允許在靜態上下文中引用調用類而非定義類。 1）解析過程在運行時進行，2）在繼承關係中向上查找調用類，3）可能帶來性能開銷。
什麼是PHP魔術方法（__ -construct，__destruct，__call，__get，__ set等）並提供用例？
Apr 03, 2025 am 12:03 AM
PHP的魔法方法有哪些？ PHP的魔法方法包括：1.\_\_construct，用於初始化對象；2.\_\_destruct，用於清理資源；3.\_\_call，處理不存在的方法調用；4.\_\_get，實現動態屬性訪問；5.\_\_set，實現動態屬性設置。這些方法在特定情況下自動調用，提升代碼的靈活性和效率。
PHP和Python：比較兩種流行的編程語言
Apr 14, 2025 am 12:13 AM
PHP和Python各有優勢，選擇依據項目需求。 1.PHP適合web開發，尤其快速開發和維護網站。 2.Python適用於數據科學、機器學習和人工智能，語法簡潔，適合初學者。
PHP行動：現實世界中的示例和應用程序
Apr 14, 2025 am 12:19 AM
PHP在電子商務、內容管理系統和API開發中廣泛應用。 1)電子商務：用於購物車功能和支付處理。 2)內容管理系統：用於動態內容生成和用戶管理。 3)API開發：用於RESTfulAPI開發和API安全性。通過性能優化和最佳實踐，PHP應用的效率和可維護性得以提升。
PHP：網絡開發的關鍵語言
Apr 13, 2025 am 12:08 AM
PHP是一種廣泛應用於服務器端的腳本語言，特別適合web開發。 1.PHP可以嵌入HTML，處理HTTP請求和響應，支持多種數據庫。 2.PHP用於生成動態網頁內容，處理表單數據，訪問數據庫等，具有強大的社區支持和開源資源。 3.PHP是解釋型語言，執行過程包括詞法分析、語法分析、編譯和執行。 4.PHP可以與MySQL結合用於用戶註冊系統等高級應用。 5.調試PHP時，可使用error_reporting()和var_dump()等函數。 6.優化PHP代碼可通過緩存機制、優化數據庫查詢和使用內置函數。 7
PHP的持久相關性：它還活著嗎？
Apr 14, 2025 am 12:12 AM
PHP仍然具有活力，其在現代編程領域中依然佔據重要地位。 1)PHP的簡單易學和強大社區支持使其在Web開發中廣泛應用；2)其靈活性和穩定性使其在處理Web表單、數據庫操作和文件處理等方面表現出色；3)PHP不斷進化和優化，適用於初學者和經驗豐富的開發者。
說明匹配表達式（PHP 8）及其與開關的不同。
Apr 06, 2025 am 12:03 AM
在PHP8 中，match表達式是一種新的控制結構，用於根據表達式的值返回不同的結果。 1)它類似於switch語句，但返回值而非執行語句塊。 2)match表達式使用嚴格比較（===），提升了安全性。 3)它避免了switch語句中可能的break遺漏問題，增強了代碼的簡潔性和可讀性。
