php处理图片-php手册-php.cn

这段时间好浮躁，不知道该从哪下手了。想学这个又觉得现在最缺那个，学了这个现在要用到那个。不知道走左边还是右边了，虽然都能到目的地。这是图片处理的笔记。只是个人笔记，没有细细研究，并且有个小错误。 1 ? php 2 header ("content-type:text/html;
这段时间好浮躁，不知道该从哪下手了。想学这个又觉得现在最缺那个，学了这个现在要用到那个。不知道走左边还是右边了，虽然都能到目的地。
这是图片处理的笔记。只是个人笔记，没有细细研究，并且有个小错误。
<span>  1</span> <span>php
</span><span>  2</span> <span>header</span>("content-type:text/html; charset=utf-8"<span>);
</span><span>  3</span> <span>error_reporting</span>(<span>E_ERROR</span> | <span>E_WARNING</span> | <span>E_PARSE</span><span>);
</span><span>  4</span> <span>function</span> echoHtml(<span>$title</span>, <span>$info</span> = '', <span>$content</span> = <span>array</span>(), <span>$tip</span> = ''<span>)
</span><span>  5</span> <span>{
</span><span>  6</span>     <span>$html</span>    = ''<span>;
</span><span>  7</span>     <span>$html</span>    .= '<h3>'.<span>$title</span>.'</h3>'<span>;
</span><span>  8</span>     <span>if</span>(<span>$info</span><span>)
</span><span>  9</span> <span>    {
</span><span> 10</span>         <span>$html</span>    .= "<p>{<span>$info</span>}</p>"<span>;
</span><span> 11</span> <span>    }
</span><span> 12</span>     <span>if</span>(<span>is_array</span>(<span>$content</span>) && !<span>empty</span>(<span>$content</span><span>))
</span><span> 13</span> <span>    {
</span><span> 14</span>         <span>foreach</span> (<span>$content</span> <span>as</span> <span>$key</span> => <span>$row</span><span>)
</span><span> 15</span> <span>        {
</span><span> 16</span>             <span>$i</span>    = <span>$key</span>+1<span>;
</span><span> 17</span>             <span>$html</span>    .= "<p>\t{<span>$i</span>}：\t{<span>$row</span>}</p>"<span>;
</span><span> 18</span> <span>        }
</span><span> 19</span> <span>    }
</span><span> 20</span>     <span>if</span>(<span>$tip</span><span>)
</span><span> 21</span> <span>    {
</span><span> 22</span>         <span>$html</span>    .= "<p><b>\tTIP：{<span>$tip</span>}</b></p>"<span>;
</span><span> 23</span> <span>    }
</span><span> 24</span>     <span>$html</span>    .= "<hr><br>"<span>;
</span><span> 25</span>     <span>echo</span> <span>$html</span><span>;
</span><span> 26</span> <span>}
</span><span> 27</span> <span>/*</span><span>*
</span><span> 28</span> <span> *    生成缩略图
</span><span> 29</span> <span> *    @param $src_img 操作图片文件名
</span><span> 30</span> <span> *    @param $new_img 新的图片文件名
</span><span> 31</span> <span> *    @param $n_w 宽度
</span><span> 32</span> <span> *    @param $n_h 高度
</span><span> 33</span> <span> *    @return resouce 
</span><span> 34</span> <span> *    @author cntnn11
</span><span> 35</span> <span> *    @date 2013-03-10
</span><span> 36</span> <span>*/</span>
<span> 37</span> <span>function</span> thumb(<span>$src_img</span>, <span>$new_img</span>, <span>$n_w</span> = 0, <span>$n_h</span> = 0<span>)
</span><span> 38</span> <span>{
</span><span> 39</span>     <span>if</span>(<span>is_file</span>(<span>$src_img</span><span>))
</span><span> 40</span> <span>    {
</span><span> 41</span>         <span>list</span>(<span>$s_w</span>, <span>$w_h</span>, <span>$s_t</span>)    = <span>getimagesize</span>(<span>$src_img</span><span>);
</span><span> 42</span> 
<span> 43</span>         <span>//</span><span>对心图片的宽高进行等比缩放限制，使用固定的公式
</span><span> 44</span> <span>        //缩放以原始图片最大的边做为新图片最大的尺寸，另一边则根据以下公式进行等比缩放
</span><span> 45</span> <span>        //如果原图的宽度小于高度，那么重新计算新图的宽度，否则重新计算新图的高度</span>
<span> 46</span>         <span>if</span>(<span>$n_w</span> && (<span>$s_w</span> $s_h<span>))
</span><span> 47</span> <span>        {
</span><span> 48</span>             <span>$n_w</span>    = (<span>$n_h</span> / <span>$s_h</span>) * <span>$s_h</span><span>;
</span><span> 49</span> <span>        }
</span><span> 50</span>         <span>else</span>
<span> 51</span> <span>        {
</span><span> 52</span>             <span>$n_h</span>    = (<span>$n_w</span> / <span>$s_w</span>) * <span>$s_w</span><span>;
</span><span> 53</span> <span>        }
</span><span> 54</span> 
<span> 55</span>         <span>//</span><span>开始生成</span>
<span> 56</span>         <span>$res_img_new</span>    = imagecreatetruecolor(<span>$n_w</span>, <span>$n_h</span><span>);
</span><span> 57</span>         <span>switch</span>(<span>$s_t</span><span>)
</span><span> 58</span> <span>        {
</span><span> 59</span>             <span>case</span> 1:
<span> 60</span>                 <span>$res_img</span>    = imagecreatefromgif(<span>$src_img</span><span>);
</span><span> 61</span>                 <span>$ext</span>        = 'gif'<span>;
</span><span> 62</span>                 <span>break</span><span>;
</span><span> 63</span>             <span>case</span> 2:
<span> 64</span>                 <span>$res_img</span>    = imagecreatefromjpeg(<span>$src_img</span><span>);
</span><span> 65</span>                 <span>$ext</span>        = 'jpg'<span>;
</span><span> 66</span>                 <span>break</span><span>;
</span><span> 67</span>             <span>case</span> 3:
<span> 68</span>                 <span>$res_img</span>    = imagecreatefrompng(<span>$src_img</span><span>);
</span><span> 69</span>                 <span>$ext</span>        = 'png'<span>;
</span><span> 70</span>                 <span>break</span><span>;
</span><span> 71</span>             <span>default</span>:
<span> 72</span>                 <span>echo</span>  '不支持的图片类型'<span>;
</span><span> 73</span>                 <span>return</span> <span>false</span><span>;
</span><span> 74</span>                 <span>break</span><span>;
</span><span> 75</span> <span>        }
</span><span> 76</span> 
<span> 77</span>         imagecopyresampled(<span>$res_img_new</span>, <span>$res_img</span>, 0, 0, 0, 0, <span>$n_w</span>, <span>$n_h</span>, <span>$s_w</span>, <span>$s_h</span><span>);
</span><span> 78</span>         <span>//</span><span>$res_img_new    = imagecreate($n_w, $n_h);
</span><span> 79</span> <span>        //imagecopyresized($res_img_new, $res_img, 0, 0, 0, 0, $n_w, $n_h, $s_w, $s_h);</span>
<span> 80</span>         <span>global</span> <span>$img_new_dir</span><span>;
</span><span> 81</span>         <span>$new_img_file</span>    = <span>$img_new_dir</span>.<span>$new_img</span>.'.'.<span>$ext</span><span>;
</span><span> 82</span>         imagejpeg(<span>$res_img_new</span>, <span>$new_img_file</span><span>);
</span><span> 83</span>         <span>//</span><span>genImage($res_img_new, $new_img_file, $s_t);</span>
<span> 84</span>         imagedestroy(<span>$res_img</span><span>);
</span><span> 85</span>         imagedestroy(<span>$res_img_new</span><span>);
</span><span> 86</span>         <span>echo</span> '缩放后的图片：'<span>;
</span><span> 87</span>         <span>echo</span> '<img  src="/static/imghw/default1.png" data-src="'.<span>$new_img_file</span>.'" class="lazy" . alt="php处理图片" >$new_img_file.'" alt="生成的缩略图" ><hr><br>'<span>;
</span><span> 88</span> <span>    }
</span><span> 89</span> <span>}
</span><span> 90</span> <span>/*</span><span>*
</span><span> 91</span> <span> *    接收传入参数生成一张图片
</span><span> 92</span> <span> *    @param $img_res 处理好的图片资源
</span><span> 93</span> <span> *    @param $img_file 新的图片地址
</span><span> 94</span> <span> *    @param $img_type 图片类型
</span><span> 95</span> <span> *    @return resouce 
</span><span> 96</span> <span> *    @author cntnn11
</span><span> 97</span> <span> *    @date 2013-03-10
</span><span> 98</span> <span>*/</span>
<span> 99</span> <span>function</span> genImage(<span>$img_res</span>, <span>$img_file</span>, <span>$img_type</span> = 2<span>)
</span><span>100</span> <span>{
</span><span>101</span>     <span>switch</span>(<span>$img_type</span><span>)
</span><span>102</span> <span>    {
</span><span>103</span>         <span>case</span> 1:
<span>104</span>             <span>return</span> imagegif(<span>$img_res</span>, <span>$img_file</span><span>);
</span><span>105</span>             <span>break</span><span>;
</span><span>106</span>         <span>case</span> 2:
<span>107</span>             <span>return</span> imagejpeg(<span>$img_res</span>, <span>$img_file</span><span>);
</span><span>108</span>             <span>break</span><span>;
</span><span>109</span>         <span>case</span> 3:
<span>110</span>             <span>return</span> imagepng(<span>$img_res</span>, <span>$img_file</span><span>);
</span><span>111</span>             <span>break</span><span>;
</span><span>112</span>         <span>default</span>:
<span>113</span>             <span>return</span> '不支持的图片类型'<span>;
</span><span>114</span>             <span>break</span><span>;
</span><span>115</span> <span>    }
</span><span>116</span> <span>}
</span><span>117</span> 
<span>118</span> <span>/*</span><span>==============================================================================================================================</span><span>*/</span>
<span>119</span> <span>global</span> <span>$img_name</span>,<span>$img_new_dir</span><span>;
</span><span>120</span> <span>$img_name</span>    = 'testimg.jpg'<span>;
</span><span>121</span> <span>$img_new_dir</span>    = 'genimages/'<span>;
</span><span>122</span> 
<span>123</span> <span>echo</span> "<p>原始测试图片：‘{<span>$img_name</span>}’</p>"<span>;
</span><span>124</span> <span>echo</span> '<img  src="/static/imghw/default1.png" data-src="'.<span>$img_name</span>.'" class="lazy" . alt="php处理图片" >$img_name.'" alt="测试图片" width="200px" >'<span>;
</span><span>125</span> 
<span>126</span> 
<span>127</span> <span>//</span><span>获取图片资源，在此使用jpg格式做测试图片</span>
<span>128</span> <span>$img_sour</span>    = imagecreatefromjpeg('testimg.jpg'<span>);
</span><span>129</span> 
<span>130</span> <span>//</span><span>图片宽高的获取</span>
<span>131</span> <span>$title</span>    = "图片宽高度获取"<span>;
</span><span>132</span> <span>$info</span>    = "涉及使用函数imagesx(img source) imagesy(img source)"<span>;
</span><span>133</span> <span>$content</span>= <span>array</span><span>(
</span><span>134</span>     'imagesx(image)：传入一个通过imagecreate_()函数创建的图片资源类型做为参数，返回宽度',
<span>135</span>     'imagesy(image)：同imagesx，返回高度！',
<span>136</span>     '测试图片的原始宽度：'.imagesx(<span>$img_sour</span>).'px 原始高度：'.imagesy(<span>$img_sour</span>).'px',
<span>137</span> <span>);
</span><span>138</span> <span>$tip</span>    = "这两个函数的参数必须是图片资源类型！！"<span>;
</span><span>139</span> echoHtml(<span>$title</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>140</span> 
<span>141</span> <span>//</span><span>另一种获取图片属性的方法</span>
<span>142</span> <span>$title</span>    = "使用getimagesize(图片名);获取图片的属性"<span>;
</span><span>143</span> <span>$info</span>    = "该函数返回一个数组，包含了宽度、高度、图片类型信息！只需接收一个文件名即可获取！"<span>;
</span><span>144</span> <span>$content</span>= <span>array</span><span>(
</span><span>145</span>     '使用方式：getimagesize('.<span>$img_name</span>.')',
<span>146</span>     '返回一个数组：下标0表示宽度，下标1表示高度，下标2表示图片类型',
<span>147</span>     '    图片类型说明：1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM',
<span>148</span>     '下标从3开始的则为文本类型，可以说是对0、1、2三个下标值的说明',
<span>149</span> <span>);
</span><span>150</span> echoHtml(<span>$title</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>151</span> 
<span>152</span> <span>//</span><span>图片缩放函数</span>
<span>153</span> <span>$title</span>    = "图片缩放，使用效果更好的imagecopyresampled()函数"<span>;
</span><span>154</span> <span>$info</span>    = "主要学习等比缩放，因为不对宽高进行约束，那么新生成的图片会变形"<span>;
</span><span>155</span> <span>$content</span>= <span>array</span><span>(
</span><span>156</span>     'imagecopyresampled(dst_image, src_image, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h)',
<span>157</span>     '参数说明：',
<span>158</span>     '   dst_image【新图片】 图片资源类型',
<span>159</span>     '   src_image【要缩略的原始图片】 图片资源类型',
<span>160</span>     '   dst_x,dst_y,dst_w,dst_h【缩略图片的X轴起点，y轴起点，宽度和高度】 数值类型',
<span>161</span>     '   src_x,src_y,src_w,src_h【原始图片的X轴起点，y轴起点，宽度和高度】 数值类型',
<span>162</span> <span>);
</span><span>163</span> <span>$tip</span>    = "还有一个imagecopyresized()的函数，参数同imagecopyresampled()函数一致，但效果没有他好，不知道为什么？"<span>;
</span><span>164</span> echoHtml(<span>$title</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>165</span> 
<span>166</span> <span>//</span><span>测试缩略方法</span>
<span>167</span> <span>$title</span>    = '写一个thumb()方法，用来等比缩略一张图片'<span>;
</span><span>168</span> <span>$info</span>    = '使用imagecopyresampled()函数来使用'<span>;
</span><span>169</span> <span>$content</span>= <span>array</span><span>(
</span><span>170</span>     '首先确定参数：原始图片，缩略图片目标位置，缩略图片的宽度和高度',
<span>171</span>     '获取图片的属性，宽高、类型，以创建相应的图片资源',
<span>172</span>     '使用固定公式算出新图片等比缩放的宽高',
<span>173</span>     '根据图片类型生成新的缩略图片',
<span>174</span>     '释放图片资源',
<span>175</span> <span>);
</span><span>176</span> <span>$tip</span>    = "生成了黑色的图片，需要解决！！！！！！！！！！！"<span>;
</span><span>177</span> echoHtml(<span>$titl</span>, <span>$info</span>, <span>$content</span>, <span>$tip</span><span>);
</span><span>178</span> thumb(<span>$img_name</span>, 'suolve1', 500, 500<span>);
</span><span>179</span> 
<span>180</span> <span>//</span><span>图片透明</span>
<span>181</span> <span>/*</span><span>imagecolortransparent()
</span><span>182</span> <span>imagecolorstotal()
</span><span>183</span> <span>imagecolorsforindex()
</span><span>184</span> <span>imagecolorallocate()
</span><span>185</span> <span>imagefill()</span><span>*/</span>
<span>186</span> 
<span>187</span> imagedestroy(<span>$img_sour</span>);
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