Simple way to get the document name of the page and file extension and uses a switch statement to do something unique based on which page you're on

switchpages.php

<?
//Gets the document name of the page. For example, index.php
$getDocument = explode('/', $_SERVER["PHP_SELF"]); 
$currentPage = $getDocument[count($getDocument) - 1];

//Switch statement
switch ($currentPage) {
    case "index.php":
		//do something unique on index.php
		break;

    case "switchpages.php":
		//Do something unique on switchpages.php
		break;
	
    default:
		echo "Default action. Page is named something other than what we switched through above.";
		break;
}
	
?>