<?php $color_ids = [ 'green' => [1, 2, 3], 'blue' => [4, 5], 'red' => [6], 'pink' => [7, 8, 9], 'yellow' => [10] ]; $select = ['green', 'red', 'yellow']; var_export( array_merge( ...array_values( array_intersect_key( $color_ids, array_flip($select) ) ) ) );
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