PHP Get site root directory

1 Place the following code in a file in the root directory of the Web site so that it can be referenced in other files. 2 3 path mode:4 5 Define(' Base_path ',Str_replace(‘\\‘,‘/‘,Realpath(dirname(__file__).‘ /‘))." /");6 7 EchoBase_path;8 9  Ten  OneOutput Result: e:/wwwroot/ A  - URL Method: -  the   -  - $PHP _self=$_server[' Php_self ']; -  + $url= ' http://'.$_server[' Http_host '].substr($PHP _self, 0,Strrpos($PHP _self, '/') +1); -  + Echo $url; A  at   -  -Output Result: http://localhost/ - other information to organize: - php Gets the site root directory -  in   -  to Echo $_server[' Http_host '];//Host of the current request: the content of the header is the domain name letter information +  - Echo $_server[' Php_self '];//The file that is currently executing the script relative to the Web site root address, even if the file is referenced by another file to get the address correctly the  *   $ Panax Notoginseng Echo $_server[' Script_name '];//The file that is currently executing the script is relative to the site root address, but when the file is referenced by another file, only the relative address of the referenced file is displayed and the relative address of the referenced script is not displayed.  -  the   +  A Echo $_server[' Document_root '];//the site relative to the server address is the absolute path name of the site #当前运行脚本所在的文档根目录. Defined in the server configuration file the  +   -  $ Echo $_server[' Script_filename '];//the absolute path name of the currently executing script.  $  -   -  the method One: - Wuyi   the  - today said the approximate site directory structure, which said how to get the site root directory, a lot of classmates are not very understanding, the following step by step: Wu  -   About  $My Site Directory to path: D:\www\message2011, test file path: D:\www\message2011\include\config.inc.PHP -  -   -  ACreate a new file in the root directory, or a separate level of directory creation, as the above example, I would like to Config.inc.gets the root directory of the site in PHP.  +  the   -  $1, get the path to the current file: __file__ with Magic constants. The path here contains the file name and the results are as follows: the  the   the  theD:\www\message2011\include\config.inc.PHP -  in   the  the2. Remove the file name from the path above, and get the path pure:dirname(__file__), the results are as follows: About  the   the  theD:\www\message2011\include +  -   the Bayi3. Return a directory to the root directory:Realpath(dirname(__file__).‘ /.. /‘), the results are as follows: the  the   -  -D:\www\message2011 the  the   the  the4, turn the left "\" into the right "/":Str_replace( ‘\\‘ , ‘/‘ ,Realpath(dirname(__file__).‘ /.. /‘) , the results are as follows: -  the   the  thed:/www/message201194  the   the  theTo this is what we want the site root directory, can be set according to the requirements of the third step to return the directory layer, such as: Return to the 2 layer is/. /.. /, then you will get D:\www\, and so on. 98  About   - 101 Method Two:102 103  104  theAt Global.Inc. defines the root directory106 107  108 109 Define("App_root",dirname(__file__)); the 111   the 113 This constant can be referenced in any PHP file the  the   the 117 require_once(App_root. " /inc/head.php ");118 119   - 121  122 123 Method Three:124  the  126 127<?PHP - 129   the 131 $PHP _self=$_server[' Php_self ']?$_server[' Php_self ']:$_server[' Script_name ']; the 133  134 135 $url= ' http://'.$_server[' Http_host '].substr($PHP _self, 0,Strrpos($PHP _self, '/') +1);136 137  138 139 Echo $url; $ 141  142 143 method Four:144 145  146 147 $basepath=$_server[' Php_self '];148 149   Max 151 $basepath=substr($basepath, 0,Strpos($basepath, "folder name")); the 153  154 155 Echo $basepath;156 157  158 159For example: You save the file as a.php and the path is:/wjj/wjj1/wjj2/a.PHP the 161  162 163 The above example is written as:164 165  166 167 $basepath=$_server[' Php_self '];168 169   the 171 $basepath=substr($basepath, 0,Strpos($basepath, "Wjj1"));172 173  174 175 Echo $basepath;176 177  178 179 Method Five: the 181  182 183 $basepath=$_server[' Php_self '];184 185  186 187 Preg_match("/(\/)? ([^\/]+)/",$basepath,$WJM);188 189   the 191 Echo $WJM[0];192 193  194 195Note that the second method I am not quite sure, such as the file path is:/wjj/wjj1/wjj2/a.php, it only returns after/WJJ/Add yourself! 196 197  198 199?>

PHP Get site root directory