<?php $array = [ ["id" => 21153, "genre" => ["History", "Drama", "Thriller"]], ["id" => 21152, "genre" => ["ACTION"]], ["id" => 21151, "genre" => ["ROMANTIC"]], ["id" => 21150, "genre" => ["Drama"]] ]; $flat = array_merge(...array_column($array, 'genre')); var_export( array_combine($flat, $flat) );
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