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<?php class Queue { private $arr = []; public function enqueue(&$e) { \array_unshift($this->arr, [&$e]); } public function &dequeue() { $x =& \array_pop($this->arr)[0]; return $x; } public function is_empty() { return empty($this->arr); } } $q = new Queue(); $a = [42, 124, 35]; $q->enqueue($a); $a[] = 1337; $b = $q->dequeue(); $b[] = 12345; var_dump($a); var_dump($b);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> int(42) [1]=> int(124) [2]=> int(35) [3]=> int(1337) } array(5) { [0]=> int(42) [1]=> int(124) [2]=> int(35) [3]=> int(1337) [4]=> int(12345) }

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