How do I check if an array already exists?

    [man]isset/man will tell you if the variable is already created, and [man]is_array/man will tell you if it's an array. You can then check to see if it's populated with [man]empty/man.

    So:

    if(isset($array) && is_array($array) && !empty($array))
{
    // Okay, $array is a non-empty array
}

      Why doesn't the following code work.

      I'm trying to test if an array exists, to insert data into it, else create the array. Only each time I access the page, the array contains no data. Why is this?

      <?php
session_start();

$id = $_GET['id'];
$array = $_SESSION['ids'];
if (!isset($array))
{
$array = array();
}
else
{

$array[] = 'Data';
$_SESSION['ids'] = $array;
}


echo $_SESSION['ids'];

print_r($array);
?>

        It is okay to ask a follow-up question in your previous thread. So I've merged them together. No reason to have 2 threads for essentially one question.

        I'm not sure why it won't work.

          $array is always set because

          $array = $_SESSION['ids'];

          How about:

          session_start();
if (!isset($_SESSION['ids']))
{
  $_SESSION['ids'] = array();
}
$_SESSION['ids'][] = 'Data';

print_r($_SESSION['ids']);
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