strtotime日期验证在无效日期传递

Question

I am in the middle of setting up a basic CMS that allows the client to add articles to their mobile app. The CMS is coded in PHP and will use JSON to deliver the content to the mobile app.

Now my problem is there is an option to publish the article at a certain date, so I want to validate the date to check it is valid.

So to test possibilites I made a small script. I am using strtotime() to check the date is valid, my script is:

<?php

    $date[] = '2011-31-01';
    $date[] = '2011-02-31';

    foreach($date as $str) {
        if(strtotime($str) == false) {
            $result[] = '<p>[' . $str . '] Resulted in an <span style="color: red;">Error.</span></p>';
        } else {
            $result[] = '<p>[' . $str . '] Resulted in <span style="color: green;">Success.</span></p>';
        }
    }

    foreach($result as $return) {
        echo $return;
    }

?>

Now my problem is the date 2011-02-31 which is 31st February 2011 is returning as valid, when obviously it isn't. So my question is why does it do this? and is there a better method to check that the date is valid and exists?

Thanks in advance.

Answer 1

checkdate(); Validates a Gregorian date. Returns TRUE if the date given is valid; otherwise returns FALSE.

 if(checkdate(2, 31, 2011)){
      echo "Yeah";

  } else {echo "nah";}

It returns false!

That's the way to go.