Split array into unique pairs

Question

Say i start with a simple array (which could be theoretically of any length):

$ids  = array(1,2,3,4);

What it the best solution for splitti

Answer 1

Fixed from my initial jump-the-gun suggestion of array_chunk()

Try this instead:

$ids  = array(1, 2, 3, 4);
$out = array();

while ($item = array_shift($ids)) {
    foreach ($ids as $key=>$value) {
        $out[] = array($item, $value);
    }
}