In php, check whether url links already have parameters. add them? Or & Code

In php, how do we check whether url links have parameters and add them? Or, let's share a function. The code is as follows: Copy the code? Php $ old_u...

In php, how do we check whether url links have parameters and add them? Or &, let's share a function.

The code is as follows:

$ Old_url = $ _ SERVER ["REQUEST_URI"]; // Check whether the link exists? $ Check = strpos ($ old_url ,'? '); // If yes? If ($ check! = False) { // If? No parameters, such as hindex. php? If (substr ($ old_url, $ check + 1) = '') { // You can add additional parameters directly. $ New_url = $ old_url; } Else // if there is a parameter, such as index. php? ID = 12 { $ New_url = $ old_url .'&'; } } Else // if it does not exist? { $ New_url = $ old_url .'? '; } Echo $ new_url; ?>