WORDPRESS: Create safe ID from ACF title

WORDPRESS: Create safe ID from ACF title

	function safeID( $string, $separator = '_' )
	{
	    $accents_regex = '~&([a-z]{1,2})(?:acute|cedil|circ|grave|lig|orn|ring|slash|th|tilde|uml);~i';
	    $special_cases = array( '&' => 'and');
	    $string = mb_strtolower( trim( $string ), 'UTF-8' );
	    $string = str_replace( array_keys($special_cases), array_values( $special_cases), $string );
	    $string = preg_replace( $accents_regex, '$1', htmlentities( $string, ENT_QUOTES, 'UTF-8' ) );
	    $string = preg_replace("/[^a-z0-9]/u", "$separator", $string);
	    $string = preg_replace("/[$separator]+/u", "$separator", $string);
	    return $string;
	}