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@ 2014-10-22T14:26:12Z

<?php

$a1 = array(
    'one',
    'two',
    'three',
    'four'
);
$a2 = array_diff($a1, $a1);
var_dump($a2);

$a2[] = 'potato';
$a2[] = 'potato';
$a2[] = 'potato';
$a2[] = 'potato';
unset($a2[5], $a2[6], $a2[7], $a2[8]);

$a3 = $a2;

$a2[] = 'five';
var_dump($a2);

$a3[] = 'jam';
var_dump($a3);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_diff: documentation ( source)

preferences:dark modelive preview

36.6 ms | 402 KiB | 5 Q