<?
    $test = pathinfo("http://localhost/index.php");
    print_r($test);
?>

Array
(
 [dirname] => http://localhost //url的路径
 [basename] => index.php //完整文件名
 [extension] => php //文件名后缀
 [filename] => index //文件名
)

<?
    $test = parse_url("http://localhost/index.php?name=tank&sex=1#top");
    print_r($test);
?>

Array
(
 [scheme] => http //使用什么协议
 [host] => localhost //主机名
 [path] => /index.php //路径
 [query] => name=tank&sex=1 // 所传的参数
 [fragment] => top //后面根的锚点
)

<?
    $test = basename("http://localhost/index.php?name=tank&sex=1#top");
    echo $test;
?>

index.php?name=tank&sex=1#top

string basename  ( string $path  [, string $suffix  ] )

<?php
$full_name = ‘/usr/local/php/php.ini‘;
$base = basename($full_name);  // $base is "php.ini"
$dir  = dirname($full_name);   // $dir is "/usr/local/php"
?>