Is this possible in php?

[kobescoresagain]

I have a txt file that I need to edit using php. I understand how to open it and everything. I am just having problems adding text into the file. Basically here is what the actually file would generally look like.

Some random xml tags

<item>
</item>
<item>
</item>
<item>
</item>
<item>
</item>

two closing xml tags.

The tags at the beginning will change often, so I am not 100% sure what will be there. But it will not ever need to be edited through this code (all done manually).

I basically want to add items into this code. I want to add the items to the beginning on the item list, and after the beinning random xml tags. It would result in

Some random xml tags

<new item>
</new item>
<item>
</item>
<item>
</item>
<item>
</item>
<item>
</item>

two closing xml tags.

I have been told that I need to bring the data in 1 line at a time, but I am not 100% sure what exactly I need to do. Anyh guidance would be greatly appreciated.

[Rimer dal]

This is untested but it is the concept... I think it is was what you wanted.

<?php

function add_data($StringToAdd){
$filename = 'test.txt';

// Let's make sure the file exists and is writable first.
if (is_writable($filename)) {

   if (!$handle = fopen($filename, 'r+')) {
         echo "Cannot open file ($filename)";
         exit;
   }
   
   $contents = fread($handle, filesize($filename));
   if(stripos("<item>")){
      $chunk1 = substr($contents,0,stripos("<item>"));
      $chunk2 = substr($contents,stripos("<item>"));
      $contents = $chunk1.$StringToAdd.$chunk2;
   }else{
       echo "Did not find <item>";
       exit;
   }

   if (fwrite($handle, $contents) === FALSE) {
       echo "Cannot write to file ($filename)";
       exit;
   }
   
   echo "Success, wrote ($contents) to file ($filename)";
   
   fclose($handle);

} else {
   echo "The file $filename is not writable";
}
?>