Description:
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System: Win2k SP4, Apache 2.0.49 PHP 4.3.6
(also tested on Win2k SP4, Apache 2.0.48 PHP 4.3.4 with same result)

I have a class that handle news in a CMS. So it also have to save the news in single files.
The srcipt below is the essence of that class. But it seems to run twice, because the save-function creates two files with different timestamps. Regardless it is only called once.

If u use the first line of show() all is working fine, but the second line with the img-tag causes trouble.

The variable $image_url ist know to the class but its uninitialized. Nevertheless this shouldnt cause such unexpected behaviour.

Reproduce code:
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class news{
  var $image_url, $timestamp;

  function show(){
//  echo $this->image_url; echo $this->image_url;   //working fine (returns nothing, create one file)
    echo "<img src=\"".$this->image_url."\" alt=\"".$this->image_url."\">";   //this causes the script to run twice
  }

  function save(){
    $fp = fopen($this->timestamp, "w");
    fclose($fp);
  }
}

$news = new news;
$news->timestamp = microtime();
$news->save();
$news->show();

Expected result:
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It should save one! file to disk and print nothing on the screen (cause $image_url is empty). The name of the file is the timestamp of its creation.