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<?php $a = ['first','second','third']; // touch refcount $b = &$a; foreach($a as $v) { echo 'Running ', $v, "\n\n"; unset($a[1]); var_dump($a); var_dump($b); } echo 'final:', "\n"; var_dump($a);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Running first array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } Running second array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } Running third array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } final: array(2) { [0]=> string(5) "first" [2]=> string(5) "third" }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Running first array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } Running third array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } array(2) { [0]=> string(5) "first" [2]=> string(5) "third" } final: array(2) { [0]=> string(5) "first" [2]=> string(5) "third" }

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