<?php $reference = [ 'a' => 'this is A', 'b' => 'here is B', 'c' => 'C here', 'd' => 'finally, d', ]; $indexesToKeep = [1, 3]; $mapKeysToIndexes = array_flip(array_keys($reference)); $keysToKeep = array_intersect($mapKeysToIndexes, $indexesToKeep); var_export(array_intersect_key($reference, $keysToKeep));
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