Check for and, if not there, add quotation marks to a string

add-quotes.php

/**
 *
 * Return string with quotation marks
 *
 * @author Joshua Nelson
 * @link http://joshuadnelson.com
 *
 */
function jdn_add_quotation( $string ) {
	if( !empty( $string ) ) {
	  	if( $string[0] == '"' && $string[strlen($string)-1] == '"' ) {
			return $string;
		} elseif( $string[0] == '"' && $string[strlen($string)-1] != '"' ) {
			$string = $string . '"';
		} elseif( $string[0] != '"' && $string[strlen($string)-1] == '"' ) {
			$string = '"' . $string;
		} else {
			$string = '"' . $string . '"';
		}
	}
	return $string;
}