discuz
$scriptName = basename($_SERVER['SCRIPT_FILENAME']); $_SERVER['SCRIPT_FILENAME']，当前执行程序的绝对路径及文件名。小编这儿返回E:/PHPWWW/test/index.php。basename 返回路径中的文件名部分。小编这儿结果$scriptName =’index.php’。
if(basename($_SERVER['SCRIPT_NAME']) === $scriptName) { $this->var['PHP_SELF'] = $_SERVER['SCRIPT_NAME'];} $_SERVER['SCRIPT_NAME']，相对于网站根目录的路径及 PHP 程序文件名称。小编这儿返回/test/index.php。小编这儿条件成立。
elseif(basename($_SERVER['PHP_SELF']) === $scriptName) { $this->var['PHP_SELF'] = $_SERVER['PHP_SELF'];} $_SERVER['PHP_SELF']，相对于网站根目录的路径及 PHP 程序文件名称。小编这儿返回/test/index.php。小编这儿条件成立。
elseif(isset($_SERVER['DOCUMENT_ROOT'])&&strpos($_SERVER['SCRIPT_FILENAME'],$_SERVER['DOCUMENT_ROOT']) === 0) { $this->var['PHP_SELF']=str_replace('\\','/',str_replace($_SERVER['DOCUMENT_ROOT'],'',$_SERVER['SCRIPT_FILENAME'])); $this->var['PHP_SELF'][0]!='/'&&$this->var['PHP_SELF']='/'.$this->var['PHP_SELF'];} $_SERVER['DOCUMENT_ROOT']根路径。$this->var['PHP_SELF'][0]这个二维数组哪儿来的？这不是赋值语句而是判断语句。虽然没测试过，但是应该不会执行到这儿吧？
$_SERVER['SCRIPT_NAME']和$_SERVER['PHP_SELF']区别，从下面例子可以看出区别在url在pathinfo。 $_SERVER['SCRIPT_NAME']http://localhost/test/ /test/index.phphttp://localhost/test/index.php /test/index.phphttp://localhost/test/index.php?a=test /test/index.phphttp://localhost/test/index.php/a/test /test/index.php$_SERVER['PHP_SELF']http://localhost/test/ /test/index.phphttp://localhost/test/index.php /test/index.phphttp://localhost/test/index.php?a=test /test/index.phphttp://localhost/test/index.php/a/test /test/index.php/a/test