Use php://temp wrapper with XMLWriter

Question

Is it possible to use the php://temp wrapper to generate an XML file with XMLWriter? I like the features it provides (memory for small files, transparent temporary file for larger output) but I can't get the syntax (if it's even possible):

<?php

header('Content-type: text/xml; charset=UTF-8');

$oXMLWriter = new XMLWriter;
$oXMLWriter->openURI('php://temp');
$oXMLWriter->startDocument('1.0', 'UTF-8');

$oXMLWriter->startElement('test');
$oXMLWriter->text('Hello, World!');
$oXMLWriter->endElement();

$oXMLWriter->endDocument();
// And now? *******
$oXMLWriter->flush();

Matthew · Accepted Answer · 2011-06-16 08:59:54Z

1

I don't understand the purpose of writing to a temp file. Perhaps you want:

$oXMLWriter->openURI('php://output');

I haven't ever used XMLWriter but it doesn't seem to take a handle to a file pointer. I think that's really what you want.

For giggles, here's something that wraps the temp interface:

class WeirdStream
{
  static public $files = array();
  private $fp;

  public function stream_open($path)
  {
    $url = parse_url($path);
    self::$files[$url['host']] = fopen('php://temp', 'rw');
    $this->fp = &self::$files[$url['host']];
    return true;
  }

  public function stream_write($data)
  {
    return fwrite($this->fp, $data);
  }
}

stream_wrapper_register('weird', 'WeirdStream');

$oXMLWriter = new XMLWriter;
$oXMLWriter->openURI('weird://a');
// .. do stuff
$oXMLWriter->flush();

Now you can get at the file pointer:

$fp = WeirdStream::$files['a'];

It may be purely in memory, or it may be a temporary file on disk.

You could then loop through the data line by line:

fseek($fp, 0, SEEK_SET);
while (!feof($fp)) $line = fgets($fp);

But this is all very odd to me.

edited Jun 16, 2011 at 8:59

answered Jun 16, 2011 at 8:32

Matthew

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6 Comments

Álvaro González Over a year ago

Purpose? Store it in a database or add it to a ZIP archive.

Matthew Over a year ago

I saw the content-type, so I assumed you were displaying it to the screen. Are you doing both stdout and saving in a DB, etc?

Álvaro González Over a year ago

My code was just a simplified example to work on the technique :)

Matthew Over a year ago

To me, the final destination is a crucial piece of information when it comes to deciding which interface to use... XMLWriter doesn't seem to take a pointer to an existing stream, so I don't think you'll get your dual memory/file interface working unless you perhaps register your own custom stream wrapper that does that.

hakre Over a year ago

is it possible to output buffer (ob_start etc.) that stream?

|

BenMorel · Accepted Answer · 2011-06-16 08:34:16Z

0

What do you need to do with the contents of php://temp eventually? If you just need a temporary, memory-only storage, then you can use openMemory():

$oXMLWriter = new XMLWriter;
$oXMLWriter->openMemory();
$oXMLWriter->startDocument('1.0', 'UTF-8');

$oXMLWriter->startElement('test');
$oXMLWriter->text('Hello, World!');
$oXMLWriter->endElement();

$oXMLWriter->endDocument();
echo $oXMLWriter->outputMemory ();

answered Jun 16, 2011 at 8:34

BenMorel

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3 Comments

Matthew Over a year ago

Perhaps he doesn't want to store it in memory if it exceeds a certain threshold. It's a bit strange though, because it seems like you'd know before you start how big the file is going to be, at least to some reasonable approximation.

BenMorel Over a year ago

If he wants to store it in a DB (as suggested above), then I think he must at some point have it in memory. As you said, without knowing the final destination, difficult to provide a good help.

Matthew Over a year ago

Yes, it seems like for most things you'd either always want it entirely in memory (to place in a db) or always saved directly to disk (to store) or always sent directly to stdout.

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