Detailed explanation of how to obtain url instance in php

When the URL parameters are known, we can use $_GET to obtain the corresponding parameter information ($_GET['name']) according to our own situation; then, how to obtain the parameter information on the URL under unknown circumstances Woolen cloth?

The first method is to use the $_SERVER built-in array Variables

The relatively primitive $_SERVER['QUERY_STRING'] is used to obtain URL parameters. This variable is usually used The data returned will be similar to this: name=tank&sex=1
If you need to include the file name, you can use $_SERVER["REQUEST_URI"](return similar to:/index.php?name=tank&sex =1)

Second, use pathinfobuilt-in function

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

Third, use parse_url built-in function

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

Fourth, use basename built-in function

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

In addition, you can also obtain the required value through regular matching processing. This method is more accurate and efficiency is not considered for the time being. . .
The following expands the regular processing method in practice:

<?php
preg_match_all("/(\w+=\w+)(#\w+)?/i","http://localhost/index.php?name=tank&sex=1#top",$match);
print_r($match);
/*
结果如下
Array
(
    [0] => Array
        (
            [0] => name=tank
            [1] => sex=1#top
        )
    [1] => Array
         (
            [0] => name=tank
             [1] => sex=1
         )
     [2] => Array
        (
             [0] =>
            [1] => #top
        )
)
*/
?>

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