PHP - checkdate() doesn't work properly

Question

Following my code:

<?php
$test = 12;
$test2 = '1a';
$test3 = 1959;
echo checkdate((int)$test, (int)$test2, (int)$test3);

It's return true. Assuming that they are POST variable, how to solve it in the most faster way without a regex?

Answer 1

You are casting the values to check to valid values before checking if they are invalid. That's why you are getting true as a result. That 1a becomes 1 after you cast it to an int. Combined with the other date parts you get 12/01/1959 which is a valid date.