How to check a string is valid format date in Mysql in php.

function isDateMySqlFormat($date)
{
    if (preg_match("/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/", $date))
        return true;
    else
        return false;
}