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Asked: 2026-05-10T17:31:14+00:00

Here’s the XML file i’m working on: <list> <activity>swimming</activity> <activity>running</activity> <activity>soccer</activity> </list> The index.php,

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Here’s the XML file i’m working on:

<list>     <activity>swimming</activity>     <activity>running</activity>     <activity>soccer</activity> </list>

The index.php, page that shows the list of activities with checkboxes, a button to delete the checked activities, and a field to add new activities:

<html> <head></head> <body> <?php     $xmldoc = new DOMDocument();     $xmldoc->load('sample.xml', LIBXML_NOBLANKS);      $count = 0;      $activities = $xmldoc->firstChild->firstChild;     //prints the list of activities, with checkboxes on the left for each item     //the $count variable is the id to each entry     if($activities!=null){         echo '<form name=\'erase\' action=\'delete.php\' method=\'post\'>' . '\n';         while($activities!=null){             $count++;             echo '    <input type=\'checkbox\' name=\'activity[]\' value=\'$count\'/>';             echo ' '.$activities->textContent.'<br/>'.'\n';             $activities = $activities->nextSibling;         }         echo '    <input type=\'submit\' value=\'erase selected\'>';         echo '</form>';     } ?> //section used for inserting new entries. this feature is working as expected. <form name='input' action='insert.php' method='post'>     insert activity:     <input type='text name='activity'/>     <input type='submit' value='send'/>     <br/> </form> </body> </html>

the delete.php, which is not working as expected:

<?php     $xmldoc = new DOMDocument();     $xmldoc->load('sample.xml', LIBXML_NOBLANKS);      $atvID = $_POST['activity'];      foreach($atvID as $id){         $delnode = $xmldoc->getElementsByTagName('activity');         $xmldoc->firstChild->removeChild($delnode->item($id));     }      $xmldoc->save('sample.xml'); ?>

I’ve tested the deletion routine without the loop, using an hard-coded arbitrary id, and it worked. I also tested the $atvID array, and it printed the selected id numbers correctly. When it is inside the loop, here’s the error it outputs:

Catchable fatal error: Argument 1 passed to DOMNode::removeChild() must be an instance of DOMNode, null given in /directorypath/delete.php on line 9

What is wrong with my code?

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1 Answer

  1. the DOMNodeList items are indexed starting with 0; You need to move the $count++ to the end of the while loop in the output step.

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