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POHow do I compare two DateTime objects in PHP 5.2.8?
 

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  1. POHow do I compare two DateTime objects in PHP 5.2.8?
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    <p>This seems like something that should be pretty straight forward, but I have been stuck <em>page faulting</em> this problem for a while now, so here goes.</p> <p>Having a look on the PHP documentation , the following two methods of the DateTime object would both seem to solve my problem:</p> <ul> <li><a href="http://au.php.net/manual/en/datetime.diff.php" rel="noreferrer">DateTime::diff</a> : Get the difference and use that to determine which is more ancient.</li> <li><a href="http://au.php.net/manual/en/datetime.gettimestamp.php" rel="noreferrer">DateTime::getTimestamp</a> : Get the UNIX timestampt and compare those.</li> </ul> <p>Both these methods are marked in the <a href="http://au.php.net/datetime" rel="noreferrer">doco</a> as being available in version >= 5.3 (and, not surprisingly, if I try to call them I find they don't exist). I can't find any specific documentation for 5.2.8 so I am not sure if there are equivalent methods in my version. I have <a href="http://www.google.com.au/search?q=compare+DateTime+PHP&amp;ie=utf-8&amp;oe=utf-8&amp;aq=t&amp;rls=org.mozilla:en-US:official&amp;client=firefox-a" rel="noreferrer">Googled</a> the problem and found an eclectic range of solutions, none of which answer my very simple requirements:</p> <ul> <li>How do I compare two DateTime objects?</li> <li>Where can I find the doco for previous PHP versions? Specifically version 5.2.8?</li> </ul> <p>For some context, I have the following code:</p> <pre><code>$st_dt = new DateTime(verifyParam ('start_date')); $end_dt = new DateTime(verifyParam ('end_date')); // is the end date more ancient than the start date? if ($end_dt &lt; $start_dt) </code></pre> <p>Apparently there is no comparison operator on this guy. </p> <p>EDIT: <em>Apparently</em> my assumptions were completely false (thanks Milen for illustrating this so effectively). There is a comparison operator and it works just fine thanks. Sometimes I really miss a compiler. The bug is in the code above, I am sure you will find it much faster than I did :).</p> <p>I look forward to my embarrassment at the simplicity of your solution.</p> <p>EDIT: And sure enough, embarrassment ensues ...</p>
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    1. CORegarding the lack of compiler - set "error_reporting" to "E_ALL" and you'll get notices like "Notice: Undefined variable: start_dt in ...".
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    2. COCheers Milen, I'll do that.
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    3. COAlso, please, use htmlentities on your `$_POST` vars, or kitten shall be killed.
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