php write and read tags

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PHP

I want to write tags into .txt file with DOMDocument parser and read them but sometimes at the end I get `&lt;` instead of `<` and `&gt;` instead of `>`

I have sort of rendering depends on `<`and `>` so when the change into `&lt;` and `&gt;` it doesn't match. but in a different part of the project everything is fine (writing, reading, rendering).

write

$fh = fopen($fn, 'wb');   $str = $this->saveXML($node);  fwrite($fh, $str );  fclose($fh);

where $fn is a string the holds the file path and the $node is the current node in the tree I'm navigating through
read

$fh = fopen($fn, 'rb');  $str = fread($fh, filesize($fn)); 
$renderer->doc .= $renderer->_xmlEntities($str);

sample input

    <par><id>22</id><date>2012-04-10T14:53:06+02:00</date>
<P_title>title</P_title>
<P_body>
body
</P_body>
<keywords>keys</keywords>
</par>

result in page source

<par><id>22</id><date>2012-04-10T14:53:06+02:00</date>
<P_title>title</P_title>
<P_body>
body
</P_body>
<keywords>keys</keywords>
</par>