PHP fwrite/fopen overwrites characters when writing

Posted: Mon Jul 04, 2005 1:23 pm (18 years, 9 months ago)

Im using a combination of the fopen and fwrite tags to add an entry to an rss file (with the .txt extension for testing). I opened the file named 'writing.txt' in r+ mode, and use fseek to change the position of the file pointer. I can write to the file at the point I want it too easy, but it overwrites the characters after the file pointer until it has finished the string. Is there any way of shifting the text after a certain point in a string along a certain amount of characters or setting fopen to an alternative mode to fix this problem?

writing.txt

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">

<channel>
<title>Main Title</title>
<description>This is the main title description</description>
<link>http://www.google.co.uk</link>

<item>
<title>Second Title</title>
<description>This is the second title description</description>
<link>http://www.google.co.uk</link>
</item>

<item>
<title>Third Title</title>
<description>This is the third title description</description>
<link>http://www.google.co.uk</link>
</item>

</channel>
</rss>

php file

Code:

<?php
$add = "<item>
<title>First Title</title>
<description>This is the first title description</description>
<link>http://www.google.co.uk</link>
</item>";

$xml = file_get_contents("writing.txt");
$handler = fopen("writing.txt", "r+");
fseek($handler, strpos($xml, "<item>"));
fwrite($handler, $add);
fclose($handler);
?>

When the php file is viewed, writing.txt ends up as this:

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0">

<channel>
<title>Main Title</title>
<description>This is the main title description</description>
<link>http://www.google.co.uk</link>

<item>
<title>First Title</title>
<description>This is the first title description</description>
<link>http://www.google.co.uk</link>
</item>m>

<item>
<title>Third Title</title>
<description>This is the third title description</description>
<link>http://www.google.co.uk</link>
</item>

</channel>
</rss>

Notice the second item has been overwritten leaving only the partial </item> tag.

Thanks.