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<?php $promos = [ '123' => ['id' => '123', 'weight' => 1], '234' => ['id' => '234', 'weight' => 3], '345' => ['id' => '345', 'weight' => 2], ]; $cr['promos'] = [ '123' => ['id' => '123', 'weight' => 1], '234' => ['id' => '234', 'weight' => 3], '345' => ['id' => '345', 'weight' => 2], ]; $promo_weights = array_column($promos, 'weight1', 'id'); var_dump($promo_weights);
Output for 5.6.30
array(0) { }