parse_url 解析url的函数

<?php
//PHP_URL_SCHEME, PHP_URL_HOST, PHP_URL_PORT, PHP_URL_USER, 
//PHP_URL_PASS, PHP_URL_PATH, PHP_URL_QUERY or PHP_URL_FRAGMENT
$url = "http://www.baidu.com/abc/ab/1.php?id=1";
$path = parse_url($url,PHP_URL_PATH);
$scheme = parse_url($url,PHP_URL_SCHEME);
$host = parse_url($url,PHP_URL_HOST);
$query = parse_url($url,PHP_URL_QUERY);
$fragment = parse_url($url,PHP_URL_FRAGMENT);
echo $path;  ///abc/ab/1.php
echo $scheme;  //http
echo $host;  //www.baidu.com
echo $query;  //id=1
echo $fragment;  // PHP_URL_QUERY 或 PHP_URL_FRAGMENT 的其中一个来获取 URL 中指定的部分的 string。