PHP dynamic method of adding URL query parameters _php

In this paper, we describe the method of dynamically adding URL query parameters in PHP. Share to everyone for your reference.

The specific analysis is as follows:

This code can dynamically add key-value query parameters to the URL and overwrite it with the new if the parameter already exists

function Add_querystring_var ($url, $key, $value) {$url =preg_replace ('/(. *) (? | &) '. $key. ' =[^&]+? (&) (. *)/I ', ' $1$2$4 ', $url. ' & '); $url =substr ($url, 0,-1); if (Strpos ($url, '? ') = = = False) {  return ($url. '? '). $key. ' = '. $value); } else {  return ($url. ') & '. $key. ' = '. $value); }}

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