How can I write text to an XML file?

For some reason when I use fopen I get the following error:

failed to open stream: HTTP wrapper does not support writeable connections in /examplefolder/examplefile.php

And when I use this:

<?php
$myFile = "http://url.com/" . $_COOKIE['user'] . "/current_pro_pic.xml"; 
$xmlw = new XMLWriter; 
$xmlw->setIndent(true); 
$xmlw->startDocument('1.0', 'UTF-8');  
$xmlw->startElement('user_current_pro_pic'); 
$xmlw->writeElement('full_url', "<![CDATA[sometexthere*]]>"); 
$xmlw->writeElement('time', date('l F jS Y ') . 'at' . date(' h:i A')); 
$xmlw->endElement(); 
$xmlw->endElement(); 
$xmlw->endElement(); 
$xmlw->endDocument(); 
?>

It spits out this:

Warning: XMLWriter::setIndent() [xmlwriter.setindent]: Invalid or unitialized XMLWriter object in *** on line 4

Warning: XMLWriter::startDocument() [xmlwriter.startdocument]: Invalid or unitialized XMLWriter object in *** on line 5

Warning: XMLWriter::startElement() [xmlwriter.startelement]: Invalid or unitialized XMLWriter object in ***p on line 6

Warning: XMLWriter::writeElement() [xmlwriter.writeelement]: Inval开发者_如何学运维id or unitialized XMLWriter object in *** on line 7

Warning: XMLWriter::writeElement() [xmlwriter.writeelement]: Invalid or unitialized XMLWriter object in *** on line 8

Warning: XMLWriter::endElement() [xmlwriter.endelement]: Invalid or unitialized XMLWriter object in *** on line 9

Warning: XMLWriter::endElement() [xmlwriter.endelement]: Invalid or unitialized XMLWriter object in *** on line 10

Warning: XMLWriter::endElement() [xmlwriter.endelement]: Invalid or unitialized XMLWriter object in *** on line 11

Warning: XMLWriter::endDocument() [xmlwriter.enddocument]: Invalid or unitialized XMLWriter object in *** on line 12

Does anyone know why this is happening? It isn't the file permissions either fyi.

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Standard gets from a web page, are always read only. The server gets a question and sends you its answer. If you want to write XML to it you would need to post it, or, send it as a variable of get (the latter is space restricted)

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You cannot write a file by referring it using a http url. Even if the file is on same server, you have to give filesystem path to the file.

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you must call one of open* methods like openMemory, openUri

$xmlw = new XMLWriter; 
$xmlw->openUri('path_to_save');
// ... or
$xmlw->openMemory();
// ... youe code
$xmlw->setIndent(true); 
// ...