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<?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") ); $result = []; foreach($purchases as $key => $purchase) { if (!isset($result[$purchase["product_id"]])) { $result[$purchase["product_id"]] = $purchase; } } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [7] => Array ( [product_id] => 7 [receipt] => R13D13 ) [5] => Array ( [product_id] => 5 [receipt] => Y28Z14 ) )

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