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copied!<pre><code><? $my_array = array(0 => 1, 1 => 2, 2 => 3, 3 => 4, 4 => 5); $your_array = array(0 => 1, 1 => 2); $the_array = array_unique(array_merge($my_array, $your_array)); $_SESSION['test'] = $the_array; print_r($the_array); echo(count($_SESSION['test'])); ?> </code></pre> <p>yields:</p> <p>Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) 5</p> <pre><code><? $my_array = array(0 => 1, 1 => 1, 2 => 1, 3 => 1, 4 => 1); $your_array = array(0 => 1, 1 => 1); $the_array = array_unique(array_merge($my_array, $your_array)); $_SESSION['test'] = $the_array; print_r($the_array); echo(count($_SESSION['test'])); ?> </code></pre> <p>yields:</p> <p>Array ( [0] => 1 ) 1</p> <p>my guess would be your stdClass Object([id] => xxxxx) are all the same...</p> <p>EDIT</p> <p>another test:</p> <pre><code><? $my_array = array(0 => array('id' => 11), 1 => array('id' => 22), 2 => array('id' => 22), 3 => array('id' => 33), 4 => array('id' => 445)); $your_array = array(0 => array('id' => 11), 1 => array('id' => 7908)); $the_array = array_unique(array_merge($my_array, $your_array), SORT_REGULAR); $_SESSION['test'] = $the_array; print_r($the_array); echo(count($_SESSION['test'])); ?> </code></pre> <p>yields:</p> <p>Array ( [0] => Array ( [id] => 11 ) [1] => Array ( [id] => 22 ) [3] => Array ( [id] => 33 ) [4] => Array ( [id] => 445 ) [6] => Array ( [id] => 7908 ) ) 5</p> <p>I think this is what you're looking for.</p>

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