src/RequestData.php
public static function issetValue(string $key): bool
    {
        $key = \mb_strtolower($key);
        return isset(self::$_data[$key]);
    }
public static function issetValue(string $key): bool
    {
        $key = \mb_strtolower($key);
        return isset(self::$_data[$key]);
    }
public static function issetValue ( string $ key ) : bool { $ key = \ mb_strtolower ( $ key ) ; return isset ( self :: $ _data [ $ key ] ) ; }
Checks whether a value t the given input key was set in the form.

@param string $key
The input key to check
@return boolean
true, if the value exists, otherwise, false
Checks whether a value t the given input key was set in the form .