How to get the complete URL address of the current page using PHP

PHP gets the complete URL address of the current page

When writing programs using PHP, we often think To get the URL of the current page.

The following provides a function for obtaining the URL of the current page and how to use it:

Example 1:

function get_full_url(){
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = $protocol.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    return $url;
 }

Detailed explanation

//获取域名或主机地址  
echo $_SERVER[&#39;HTTP_HOST&#39;]."<br>"; #localhost
 
//获取网页地址 
echo $_SERVER[&#39;PHP_SELF&#39;]."<br>"; #/blog/testurl.php
 
//获取网址参数 
echo $_SERVER["QUERY_STRING"]."<br>"; #id=5
 
//获取完整的url
echo &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;REQUEST_URI&#39;];
echo &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].$_SERVER[&#39;PHP_SELF&#39;].&#39;?&#39;.$_SERVER[&#39;QUERY_STRING&#39;];
#http://localhost/blog/testurl.php?id=5
 
//包含端口号的完整url
echo &#39;http://&#39;.$_SERVER[&#39;SERVER_NAME&#39;].&#39;:&#39;.$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"]; 
#http://localhost:80/blog/testurl.php?id=5
 
//只取路径
$url=&#39;http://&#39;.$_SERVER[&#39;SERVER_NAME&#39;].$_SERVER["REQUEST_URI"]; 
echo dirname($url);

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