<?php $array = [ [ 'price' => [ 'cost' => 200, 'tax' => 10, 'total' => 210 ], 'otherKey' => 'etc' ], [ 'price' => [ 'cost' => 500, 'tax' => 50, 'total' => 550 ], 'otherKey' => 'etc' ], [ 'price' => [ 'cost' => 600, 'tax' => 60, 'total' => 660 ], 'otherKey' => 'etc' ], ]; var_export( array_column( array_column( $array, 'price' ), 'total' ) );
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