PHP从XML中删除元素

Question

I want to remove tasks that are older than today, but I can't quite figure out how to remove elements from XML file yet.

$xml_file = simplexml_load_file('file.xml');    
foreach ($xml_file->task as $aTask) {
        if ($aTask->date < $today) {
            //$xml_file->removeChild($aTask); //doesnt work
        }
}

Here is my XML file below:

<?xml version="1.0"?>
<calender>
<task><date>00/00/0000</date><title>My Birthday</title><description>Today is my birthday!</description></task><task><date>04/01/2013</date><title>ghh</title><description>jfhjhj</description></task><task><date>04/01/2013</date><title>egfwe</title><description>wefwef</description></task><task><date>04/01/2013</date><title>cvbhm</title><description>dhmdh</description></task><task><date>04/02/2013</date><title>gg</title><description>gg</description></task><task><date>04/02/2013</date><title>test</title><description>test</description></task><task><date>04/03/2013</date><title>ggg</title><description>ggg</description></task><task><date>04/03/2013</date><title>ssdv</title><description>ssdvs</description></task><task><date>04/03/2013</date><title>test</title><description>testtest</description></task><task><date>04/04/2013</date><title>tttt</title><description>ttttttttt</description></task><task><date>04/05/2013</date><title>qewerbqwer</title><description>bwerbwerbwebr</description></task><task><date>04/07/2013</date><title>fgj</title><description>fghj f</description></task><task><date>04/08/2013</date><title>test</title><description>swdefswde</description></task><task><date>04/09/2013</date><title>hj,h</title><description>hj,gh</description></task><task><date>04/16/2013</date><title>dfbd</title><description>dfbdfb</description></task><task><date>04/17/2013</date><title>dfb</title><description>dfb</description></task>
</calender>

can someone please help me?

Answer 1

Using simplexml: --> live demo @ http://codepad.viper-7.com/Jl16Oh

$xml = simplexml_load_string($x); // XML is in $x

$today = date("m/d/Y");
$max = $xml->task->count()-1;

for ($i = $max; $i >=0; $i--) {

   if ($xml->task[$i]->date < $today) unset($xml->task[$i]);

}