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<?php $arr = array ( Array ( "contact_id" => 5000, 'invoice' => 476 ), Array ( 'contact_id' => 5000, 'invoice' => 396 ), Array ( 'contact_id' => 1490, 'invoice' => 1083 ), Array ( 'contact_id' => 1490, 'invoice' => 498 )); $res =array(); Foreach($arr as $subarr){ Foreach($subarr as $key => $val){ If($key == "contact_id") { If(!isset($res[$val])) $res[$val] = array(); $cid = $val; }Else{ $res[$cid][]= $val; } } } Var_dump($res);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [5000]=> array(2) { [0]=> int(476) [1]=> int(396) } [1490]=> array(2) { [0]=> int(1083) [1]=> int(498) } }

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