PHP获取站点根目录
<span style="color: #008080;"> 1</span> <span style="color: #000000;">将下面的代码放在网站根目录下的一个文件中，以便在其它文件中引用。</span><span style="color: #008080;"> 2</span> <span style="color: #008080;"> 3</span> <span style="color: #000000;">路径方式：</span><span style="color: #008080;"> 4</span> <span style="color: #008080;"> 5</span> <span style="color: #008080;">define</span>('BASE_PATH',<span style="color: #008080;">str_replace</span>('\\','/',<span style="color: #008080;">realpath</span>(<span style="color: #008080;">dirname</span>(<span style="color: #ff00ff;">__FILE__</span>).'/'))."/"<span style="color: #000000;">);</span><span style="color: #008080;"> 6</span> <span style="color: #008080;"> 7</span> <span style="color: #0000ff;">echo</span><span style="color: #000000;"> BASE_PATH;</span><span style="color: #008080;"> 8</span> <span style="color: #008080;"> 9</span> <span style="color: #008080;"> 10</span> <span style="color: #008080;"> 11</span> 输出结果：E:/wwwroot/<span style="color: #008080;"> 12</span> <span style="color: #008080;"> 13</span> <span style="color: #000000;">url方式：</span><span style="color: #008080;"> 14</span> <span style="color: #008080;"> 15</span> <span style="color: #008080;"> 16</span> <span style="color: #008080;"> 17</span> <span style="color: #800080;">$PHP_SELF</span>=<span style="color: #800080;">$_SERVER</span>['PHP_SELF'<span style="color: #000000;">];</span><span style="color: #008080;"> 18</span> <span style="color: #008080;"> 19</span> <span style="color: #800080;">$url</span>='http://'.<span style="color: #800080;">$_SERVER</span>['HTTP_HOST'].<span style="color: #008080;">substr</span>(<span style="color: #800080;">$PHP_SELF</span>,0,<span style="color: #008080;">strrpos</span>(<span style="color: #800080;">$PHP_SELF</span>,'/')+1<span style="color: #000000;">);</span><span style="color: #008080;"> 20</span> <span style="color: #008080;"> 21</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$url</span><span style="color: #000000;">;</span><span style="color: #008080;"> 22</span> <span style="color: #008080;"> 23</span> <span style="color: #008080;"> 24</span> <span style="color: #008080;"> 25</span> 输出结果：http:<span style="color: #008000;">//</span><span style="color: #008000;">localhost/</span><span style="color: #008080;"> 26</span> <span style="color: #000000;">其它的资料整理：</span><span style="color: #008080;"> 27</span> <span style="color: #000000;">PHP取得站点根目录</span><span style="color: #008080;"> 28</span> <span style="color: #008080;"> 29</span> <span style="color: #008080;"> 30</span> <span style="color: #008080;"> 31</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$_SERVER</span>['HTTP_HOST'];<span style="color: #008000;">//</span><span style="color: #008000;">当前请求的 Host: 头部的内容 即域名信信息</span><span style="color: #008080;"> 32</span> <span style="color: #008080;"> 33</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$_SERVER</span>['PHP_SELF'];<span style="color: #008000;">//</span><span style="color: #008000;">当前正在执行脚本的文件相对网站根目录地址，就算该文件被其他文件引用也可以正确得到地址</span><span style="color: #008080;"> 34</span> <span style="color: #008080;"> 35</span> <span style="color: #008080;"> 36</span> <span style="color: #008080;"> 37</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$_SERVER</span>['SCRIPT_NAME'];<span style="color: #008000;">//</span><span style="color: #008000;">当前正在执行脚本的文件相对网站根目录地址，但当该文件被其他文件引用时，只显示引用文件的相对地址，不显示该被引用脚本的相对地址。</span><span style="color: #008080;"> 38</span> <span style="color: #008080;"> 39</span> <span style="color: #008080;"> 40</span> <span style="color: #008080;"> 41</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$_SERVER</span>['DOCUMENT_ROOT'];<span style="color: #008000;">//</span><span style="color: #008000;">网站相对服务器地址即网站的绝对路径名 #当前运行脚本所在的文档根目录。在服务器配置文件中定义</span><span style="color: #008080;"> 42</span> <span style="color: #008080;"> 43</span> <span style="color: #008080;"> 44</span> <span style="color: #008080;"> 45</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$_SERVER</span>['SCRIPT_FILENAME'];<span style="color: #008000;">//</span><span style="color: #008000;">当前执行脚本的绝对路径名。</span><span style="color: #008080;"> 46</span> <span style="color: #008080;"> 47</span> <span style="color: #008080;"> 48</span> <span style="color: #008080;"> 49</span> <span style="color: #000000;">方法一：</span><span style="color: #008080;"> 50</span> <span style="color: #008080;"> 51</span> <span style="color: #008080;"> 52</span> <span style="color: #008080;"> 53</span> <span style="color: #000000;">今天讲了大致的站点目录结构，其中说到了怎样取得站点根目录，好多同学不是很理解，下面一步一步道来：</span><span style="color: #008080;"> 54</span> <span style="color: #008080;"> 55</span> <span style="color: #008080;"> 56</span> <span style="color: #008080;"> 57</span> 我的站点目录据对路径：D:\www\message2011，测试文件路径：D:\www\message2011\<span style="color: #0000ff;">include</span>\config.inc.<span style="color: #000000;">php</span><span style="color: #008080;"> 58</span> <span style="color: #008080;"> 59</span> <span style="color: #008080;"> 60</span> <span style="color: #008080;"> 61</span> 在根目录下新建一个文件，也可以隔一层目录创建，就以上面为例，我要在config.inc.<span style="color: #000000;">php中取得站点的根目录。</span><span style="color: #008080;"> 62</span> <span style="color: #008080;"> 63</span> <span style="color: #008080;"> 64</span> <span style="color: #008080;"> 65</span> 1<span style="color: #000000;">、取得当前文件的路径：用魔术常量__FILE__。这里的路径包含了文件名，结果如下：</span><span style="color: #008080;"> 66</span> <span style="color: #008080;"> 67</span> <span style="color: #008080;"> 68</span> <span style="color: #008080;"> 69</span> D:\www\message2011\<span style="color: #0000ff;">include</span>\config.inc.<span style="color: #000000;">php</span><span style="color: #008080;"> 70</span> <span style="color: #008080;"> 71</span> <span style="color: #008080;"> 72</span> <span style="color: #008080;"> 73</span> 2、去掉上面路径的文件名，得到纯路径：<span style="color: #008080;">dirname</span>(<span style="color: #ff00ff;">__FILE__</span><span style="color: #000000;">)，结果如下：</span><span style="color: #008080;"> 74</span> <span style="color: #008080;"> 75</span> <span style="color: #008080;"> 76</span> <span style="color: #008080;"> 77</span> D:\www\message2011\<span style="color: #0000ff;">include</span><span style="color: #008080;"> 78</span> <span style="color: #008080;"> 79</span> <span style="color: #008080;"> 80</span> <span style="color: #008080;"> 81</span> 3、返回一层目录到根目录：<span style="color: #008080;">realpath</span>(<span style="color: #008080;">dirname</span>(<span style="color: #ff00ff;">__FILE__</span>).'/../'<span style="color: #000000;">)，结果如下：</span><span style="color: #008080;"> 82</span> <span style="color: #008080;"> 83</span> <span style="color: #008080;"> 84</span> <span style="color: #008080;"> 85</span> D:<span style="color: #000000;">\www\message2011</span><span style="color: #008080;"> 86</span> <span style="color: #008080;"> 87</span> <span style="color: #008080;"> 88</span> <span style="color: #008080;"> 89</span> 4、把向左的”\“转化成向右的”/“：<span style="color: #008080;">str_replace</span>( '\\' , '/' , <span style="color: #008080;">realpath</span>(<span style="color: #008080;">dirname</span>(<span style="color: #ff00ff;">__FILE__</span>).'/../'<span style="color: #000000;">))，结果如下：</span><span style="color: #008080;"> 90</span> <span style="color: #008080;"> 91</span> <span style="color: #008080;"> 92</span> <span style="color: #008080;"> 93</span> D:/www/<span style="color: #000000;">message2011</span><span style="color: #008080;"> 94</span> <span style="color: #008080;"> 95</span> <span style="color: #008080;"> 96</span> <span style="color: #008080;"> 97</span> 到这就是我们想要的站点根目录了，可以根据需求设定第三步返回目录层数，比如：返回2层就是 /../../，那么就会得到 D:<span style="color: #000000;">\www\，以此类推。</span><span style="color: #008080;"> 98</span> <span style="color: #008080;"> 99</span> <span style="color: #008080;">100</span> <span style="color: #008080;">101</span> <span style="color: #000000;">方法二：</span><span style="color: #008080;">102</span> <span style="color: #008080;">103</span> <span style="color: #008080;">104</span> <span style="color: #008080;">105</span> 在global.<span style="color: #000000;">inc 里定义根目录</span><span style="color: #008080;">106</span> <span style="color: #008080;">107</span> <span style="color: #008080;">108</span> <span style="color: #008080;">109</span> <span style="color: #008080;">define</span>("APP_ROOT",<span style="color: #008080;">dirname</span>(<span style="color: #ff00ff;">__FILE__</span><span style="color: #000000;">));</span><span style="color: #008080;">110</span> <span style="color: #008080;">111</span> <span style="color: #008080;">112</span> <span style="color: #008080;">113</span> <span style="color: #000000;">在任何PHP文件中可以引用该常量</span><span style="color: #008080;">114</span> <span style="color: #008080;">115</span> <span style="color: #008080;">116</span> <span style="color: #008080;">117</span> <span style="color: #0000ff;">require_once</span>(APP_ROOT."/inc/head.php"<span style="color: #000000;">);</span><span style="color: #008080;">118</span> <span style="color: #008080;">119</span> <span style="color: #008080;">120</span> <span style="color: #008080;">121</span> <span style="color: #008080;">122</span> <span style="color: #008080;">123</span> <span style="color: #000000;">方法三：</span><span style="color: #008080;">124</span> <span style="color: #008080;">125</span> <span style="color: #008080;">126</span> <span style="color: #008080;">127</span> <span style="color: #000000;">php</span><span style="color: #008080;">128</span> <span style="color: #008080;">129</span> <span style="color: #008080;">130</span> <span style="color: #008080;">131</span> <span style="color: #800080;">$PHP_SELF</span>=<span style="color: #800080;">$_SERVER</span>['PHP_SELF'] ? <span style="color: #800080;">$_SERVER</span>['PHP_SELF'] : <span style="color: #800080;">$_SERVER</span>['SCRIPT_NAME'<span style="color: #000000;">];</span><span style="color: #008080;">132</span> <span style="color: #008080;">133</span> <span style="color: #008080;">134</span> <span style="color: #008080;">135</span> <span style="color: #800080;">$url</span>='http://'.<span style="color: #800080;">$_SERVER</span>['HTTP_HOST'].<span style="color: #008080;">substr</span>(<span style="color: #800080;">$PHP_SELF</span>,0,<span style="color: #008080;">strrpos</span>(<span style="color: #800080;">$PHP_SELF</span>, '/')+1<span style="color: #000000;">);</span><span style="color: #008080;">136</span> <span style="color: #008080;">137</span> <span style="color: #008080;">138</span> <span style="color: #008080;">139</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$url</span><span style="color: #000000;">;</span><span style="color: #008080;">140</span> <span style="color: #008080;">141</span> <span style="color: #008080;">142</span> <span style="color: #008080;">143</span> <span style="color: #000000;">方法四：</span><span style="color: #008080;">144</span> <span style="color: #008080;">145</span> <span style="color: #008080;">146</span> <span style="color: #008080;">147</span> <span style="color: #800080;">$basepath</span>=<span style="color: #800080;">$_SERVER</span>['PHP_SELF'<span style="color: #000000;">];</span><span style="color: #008080;">148</span> <span style="color: #008080;">149</span> <span style="color: #008080;">150</span> <span style="color: #008080;">151</span> <span style="color: #800080;">$basepath</span>=<span style="color: #008080;">substr</span>(<span style="color: #800080;">$basepath</span>,0,<span style="color: #008080;">strpos</span>(<span style="color: #800080;">$basepath</span>,"文件夹名称"<span style="color: #000000;">));</span><span style="color: #008080;">152</span> <span style="color: #008080;">153</span> <span style="color: #008080;">154</span> <span style="color: #008080;">155</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$basepath</span><span style="color: #000000;">;</span><span style="color: #008080;">156</span> <span style="color: #008080;">157</span> <span style="color: #008080;">158</span> <span style="color: #008080;">159</span> 如:你把文件保存为a.php并路径为：/wjj/wjj1/wjj2/a.<span style="color: #000000;">php</span><span style="color: #008080;">160</span> <span style="color: #008080;">161</span> <span style="color: #008080;">162</span> <span style="color: #008080;">163</span> <span style="color: #000000;">上面的例子就写成：</span><span style="color: #008080;">164</span> <span style="color: #008080;">165</span> <span style="color: #008080;">166</span> <span style="color: #008080;">167</span> <span style="color: #800080;">$basepath</span>=<span style="color: #800080;">$_SERVER</span>['PHP_SELF'<span style="color: #000000;">];</span><span style="color: #008080;">168</span> <span style="color: #008080;">169</span> <span style="color: #008080;">170</span> <span style="color: #008080;">171</span> <span style="color: #800080;">$basepath</span>=<span style="color: #008080;">substr</span>(<span style="color: #800080;">$basepath</span>,0,<span style="color: #008080;">strpos</span>(<span style="color: #800080;">$basepath</span>,"wjj1"<span style="color: #000000;">));</span><span style="color: #008080;">172</span> <span style="color: #008080;">173</span> <span style="color: #008080;">174</span> <span style="color: #008080;">175</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$basepath</span><span style="color: #000000;">;</span><span style="color: #008080;">176</span> <span style="color: #008080;">177</span> <span style="color: #008080;">178</span> <span style="color: #008080;">179</span> <span style="color: #000000;">方法五：</span><span style="color: #008080;">180</span> <span style="color: #008080;">181</span> <span style="color: #008080;">182</span> <span style="color: #008080;">183</span> <span style="color: #800080;">$basepath</span>=<span style="color: #800080;">$_SERVER</span>['PHP_SELF'<span style="color: #000000;">];</span><span style="color: #008080;">184</span> <span style="color: #008080;">185</span> <span style="color: #008080;">186</span> <span style="color: #008080;">187</span> <span style="color: #008080;">preg_match</span>("/(\/)?([^\/]+)/",<span style="color: #800080;">$basepath</span>,<span style="color: #800080;">$wjm</span><span style="color: #000000;">);</span><span style="color: #008080;">188</span> <span style="color: #008080;">189</span> <span style="color: #008080;">190</span> <span style="color: #008080;">191</span> <span style="color: #0000ff;">echo</span> <span style="color: #800080;">$wjm</span>[0<span style="color: #000000;">];</span><span style="color: #008080;">192</span> <span style="color: #008080;">193</span> <span style="color: #008080;">194</span> <span style="color: #008080;">195</span> 注意，第二种方法我不太会，如文件路径为：/wjj/wjj1/wjj2/a.php，它只返回 /wjj 后面的/<span style="color: #000000;">自己加！</span><span style="color: #008080;">196</span> <span style="color: #008080;">197</span> <span style="color: #008080;">198</span> <span style="color: #008080;">199</span> ?>
