How can the $_SERVER array be used to gather information about the current URL in PHP?

To gather information about the current URL in PHP, you can use the `$_SERVER` array which contains server and execution environment information. Specifically, you can access the 'REQUEST_URI' key in the `$_SERVER` array to get the current URL. This key contains the URI which was given in order to access the page. 

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

Keywords

$_SERVER array current URL PHP information gathering

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