<?php $arr1 = ["apple" => "bla", "peer" => "bleh"]; $arr2 = ["apple" => "foo", "bar" => "baz"]; $arr1Keys = array_keys($arr1); $arr2Keys = array_keys($arr2); $totalKeys = array_unique(array_merge($arr1Keys, $arr2Keys)); var_dump($arr1Keys, $arr2Keys, $totalKeys);
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