extract_username_from_url.php

/**
 * Extract the twitter user name from a twitter URL
 * @param  [type] $user_name [description]
 * @return [type]            [description]
 */
public static function extract_username_from_url( $user_name ) {
	// remove https://twitter.com/
	$user_name = str_replace( 'https://twitter.com/', '', $user_name );
	$user_name = str_replace( 'https://www.twitter.com/', '', $user_name );

	// remove http://twitter.com/
	$user_name = str_replace( 'http://twitter.com/', '', $user_name );
	$user_name = str_replace( 'http://www.twitter.com/', '', $user_name );

	// without protocol
	$user_name = str_replace( 'twitter.com/', '', $user_name );
	$user_name = str_replace( 'www.twitter.com/', '', $user_name );

	// remove '@'
	$user_name = str_replace( '@', '', $user_name );

	// remove '/''
	$user_name = str_replace( '/', '', $user_name );			

	return $user_name;
}