Sunday, March 20, 2011

Cannot iterate through object in Ubuntu PHP 5.2.10-2 Works on PHP 5.2.10?

With this code I am iterating through an object.


  • Windows with WAMP and PHP 5.2.9
  • Linux web server with PHP 5.2.10

It is not working on my desktop:

  • Ubuntu 9.10 with PHP 5.2.10-2 from the repo's
$incomingData = json_decode($_POST['data']);

foreach($incomingData as $key => $action)


Invalid argument supplied for foreach()

From stackoverflow
  • Are you sure you've got your PHP versions right?

    From the documentation for foreach:

    As of PHP 5, it is possible to iterate objects too.

    Try using json_decode with the second argument set to true, to make json_decode return associative arrays rather than objects.

    $incomingData = json_decode($_POST['data'], true);

    Where the second argument, $assoc (defaults to false) means:

    When TRUE, returned objects will be converted into associative arrays.

    My guess is that one box has less than PHP 5.

    To confirm that's the issue, try changing $incomingData to some kind of innocuous associative array:

    $incomingData = array("foo" => "bar", "baz" => "monkey");

    and see if that makes the error go away.

    richard : Thanks for your response. I'm sure I got the versions right. I added the argument to json_decode and edited my code but it produces the same error.
  • Maybe one of your servers has magic_quotes_gpc enabled, so you can try to use stripslashes on $_POST['data'] before you decode it. Both PHP versions should be able to iterate through objects.

    Dominic Rodger : If this fixes it, you really ought to fix whichever server has magic_quotes_gpc enabled, and turn it off (see
    David Thomas : +1 for the good catch. =)
    richard : Thanks! Adding stripslashes did the trick! The data I was decoding had indeed backslashes in it.
  • try doing:

    $data_array = get_object_vars(json_decode($json_data));
    this is only if you obtain information from some web page such as
    $data = file_get_contents('');
    $data_array = get_object_vars(json_decode($data));

    also, you were probably trying to do json_encode, but instead put json_decode($_POST['data']);

    unless you have json string inside of $_POST['data']; it will not work.


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