Created
April 8, 2015 14:25
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| function f($a, $k) { | |
| $b = $a; | |
| $c = &$k; | |
| $b[$k] = null; | |
| if (null === $a[$k]) { | |
| $a[$k] = $c; | |
| return true; | |
| } | |
| return false; | |
| } |
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