- var_dump: documentation ( source)
<?php
$handlers = array(
array('ids' => array(1, 2, 3)),
array('ids' => array(4, 5, 6)),
array('ids' => array(7, 8, 9)),
);
$ids = array();
foreach ($handlers as $handler) {
$ids += $handler['ids'];
}
var_dump($ids);