Date validation?

[eluser]pixelbath[/eluser]
I used wdm's solution (ported to a pre-1.7 version of CI), but had issues with the regex not catching extra characters appended to the end of the date string, for example "2008-12-25 foo".

If anyone else should have this same problem, I just threw in some extra checks before passing the values to checkdate(). Despite the PHP manual implying that it would simply return false on error, instead it errors out with "A non well formed numeric value encountered"

I also set the validation message in the function so I'd only need to do it once.

Code:

function valid_date($str) {
    $CI =& get_instance();
    $CI->validation->set_message('valid_date', 'The %s field must be entered in YYYY-MM-DD format.');

    if (ereg("([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})", $str)) {
        $arr = split("-", $str);
        $yyyy = $arr[0];
        $mm = $arr[1];
        $dd = $arr[2];
        if (is_numeric($yyyy) && is_numeric($mm) && is_numeric($dd)) {
            return checkdate($mm, $dd, $yyyy);
        } else {
            return false;
        }
    } else {
        return false;
    }
}