Why does this simple php script crash?

Question

Running this on my local wamp server gives me ERR_CONNECTION_RESET when trying to access the .php file through a browser. Whats going on here?

<?php
$catalog = simplexml_load_file('http://www.w3schools.com/xml/cd_catalog.xml');

session_start();

if (!isset($_SESSION['selection'])) {
    $_SESSION['selection'] = array();
}

array_push($_SESSION['selection'], $catalog->CD[0]);
?>

here is a piece of the output of var_dump($catalog)

object(SimpleXMLElement)[1]
  public 'CD' => 
    array (size=26)
      0 => 
        object(SimpleXMLElement)[2]
          public 'TITLE' => string 'Empire Burlesque' (length=16)
          public 'ARTIST' => string 'Bob Dylan' (length=9)
          public 'COUNTRY' => string 'USA' (length=3)
          public 'COMPANY' => string 'Columbia' (length=8)
          public 'PRICE' => string '10.90' (length=5)
          public 'YEAR' => string '1985' (length=4)
      1 => [...]

EDIT: Found this from looking in the apache log as suggested:

[Tue Apr 02 09:34:54 2013] [error] [client 127.0.0.1] PHP Fatal error:  Uncaught exception 'Exception' with message 'Serialization of 'SimpleXMLElement' is not allowed' in [no active file]:0\nStack trace:\n#0 {main}\n  thrown in [no active file] on line 0

So i guess the problem is that php's session serialization doesnt allow SimpleXMLElements. I'll save an index or something instead.

Have you debugged it? Or eliminated line-by-line to get the minimal cause? — Grant Thomas
– Grant Thomas, Commented Apr 2, 2013 at 7:30
What happens when you download the xml file and access it locally? — Ja͢ck
– Ja͢ck, Commented Apr 2, 2013 at 7:32
i dont know how to go into debug mode in php, but the cause is in the last line, where a SimpleXMLElement is pushed to an array. I can push a normal string onto the array, or an object i defined myself, but when try to push an object from the $catalog-CD array, it crashes or something. — quad16
– quad16, Commented Apr 2, 2013 at 7:34

Victor · Accepted Answer · 2013-04-02 07:33:26Z

3

Insert something on top your program like this:

error_reporting(E_ALL);
ini_set('error_log', 'phperror.log');
ini_set('log_errors_max_len', 0);
ini_set('log_errors', true);

and look at error file after error.

answered Apr 2, 2013 at 7:33

Victor

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