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<?php function isIndexNormalized($array){ $array[] = 'aux'; return (array_key_last($array) + 1) === count($array); } // ------- $array = [0, 1, 2, 3]; unset($array[3]); var_dump(isIndexNormalized($array)); $array[] = "x"; var_dump([0, 1, 2, "x"] === $array, $array); echo "\n\n\n\n"; // ------- $array = [0, 1, 2]; var_dump(isIndexNormalized($array)); $array[] = "x"; var_dump([0, 1, 2, "x"] === $array, $array);
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [4]=> string(1) "x" } bool(true) bool(true) array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) [3]=> string(1) "x" }

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