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<?php $a = [4=>'a', 17=>'b', 1=>'c', 23=>'d']; foreach($a as $k=>$v) { var_dump($k, $v); }
Output for 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(4) string(1) "a" int(17) string(1) "b" int(1) string(1) "c" int(23) string(1) "d"

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179.81 ms | 403 KiB | 197 Q