src/StringUtils.php
public static function quote($val = "", $q = "\"")
    {
        if (is_string($val)) {
            return $q . $val . $q;
        } elseif (is_numeric($val)) {
            return $val;
        } elseif (is_array($val)) {
            return "StringUtils::quote returned 'array'! ";
        } else {
            return $q . $val . $q;
        }
    }
public static function quote($val = "", $q = "\"")
    {
        if (is_string($val)) {
            return $q . $val . $q;
        } elseif (is_numeric($val)) {
            return $val;
        } elseif (is_array($val)) {
            return "StringUtils::quote returned 'array'! ";
        } else {
            return $q . $val . $q;
        }
    }
Encloses and input string with double quotes.
@param  string $val
@param  string $q
@return string