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<?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 for git.master, git.master_jit, rfc.property-hooks
array(0) { } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(4) "five" } array(5) { [0]=> string(6) "potato" [1]=> string(6) "potato" [2]=> string(6) "potato" [3]=> string(6) "potato" [4]=> string(3) "jam" }

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