<?php $purchases = array( array('product_id' => 7, 'receipt' => 'R13D13'), array('product_id' => 5, 'receipt' => 'Y28Z14'), array('product_id' => 7, 'receipt' => 'R02310'), array('product_id' => 5, 'receipt' => 'E11403') ); $arr = array_values(array_column($purchases, null, "product_id")); print_r($arr);
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