Functions to get social media handlers from URL.

SocialMediaHandlerFromURL.php

<?php

  /*
    Right now it only works with Facebook, Twitter, and Instagram.
    
    Very very beta version. Treat softly :)
  */

  function getFacebookHandlerFromURL($fbURL) {
   	$lowercaseURL = strtolower($fbURL);
   	$positionOfDotCom = strpos($lowercaseURL, ".com/");
  
   	if ($positionOfDotCom === false) {
   		return $fbURL;
   	} else {
   		$partsOfURL = explode(".com/", $lowercaseURL);
   		$secondPartOfURL = $partsOfURL[1];
  
   		// Case: /pages/handler
   		$positionOfPagesTextInURL = strpos($secondPartOfURL, "pages/");
   		if ($positionOfPagesTextInURL === false) {
   			// No 'pages' in url.
   			$fbHandler = $secondPartOfURL;
  
   			// Case: /handler/ (note: only if URL doesn't have '/pages/')
   			$firstSlashAfterHandler = strpos($fbHandler, "/");
   			if ($firstSlashAfterHandler !== false ) {
   				$fbHandler = substr($fbHandler, 0, $firstSlashAfterHandler);
   			}
   		} else {
   			// We're dealing with a FB pages.
   			$fbHandler = substr($secondPartOfURL, 6);
   		}
  
   		// Case: /handler?action=value
   		$firstQuestionMarkOnHandler = strpos($fbHandler, "?");
   		if ($firstQuestionMarkOnHandler !== false) {
   			$fbHandler = substr($fbHandler, 0, $firstQuestionMarkOnHandler);
   		}
  
   		return $fbHandler;
   	}
  }
  
  function getTwitterHandlerFromURL($twtURL) {
   	return getFacebookHandlerFromURL($twtURL);
  }
  
  function getInstagramHandlerFromURL($igURL) {
    return getFacebookHandlerFromURL($igURL);
  } 
   
?>