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<?php $a = [9 => true, 10 => true]; var_dump($a); $b = array_pop($a); var_dump($a); $a[] = false; var_dump($a);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(2) { [9]=> bool(true) [10]=> bool(true) } array(1) { [9]=> bool(true) } array(2) { [9]=> bool(true) [10]=> bool(false) }

preferences:
89.62 ms | 1469 KiB | 4 Q