How can the current URL of a PHP file be obtained?

To obtain the current URL of a PHP file, you can use a combination of server variables like $_SERVER['HTTP_HOST'] and $_SERVER['REQUEST_URI']. These variables contain information about the server and the requested URI, which can be concatenated to form the complete URL. 

$currentURL = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
echo $currentURL;

Keywords

$_SERVER PHP current URL $_SERVER['REQUEST_URI'] $_SERVER['HTTP_HOST']

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