<?php $a = [ "a" => ['keycode' => '0001','date' =>"2015-09-08"], "b" => ['keycode' => '0002','date' =>"2015-09-05"], "c" => ['keycode' => '0003','date' =>"2015-09-04"], "d" => ['keycode' => '0001','date' =>"2015-09-01"], "e" => ['keycode' => '0001','date' =>"2015-10-01"] ]; $arr = array_column($a, "date", "keycode"); echo $arr["0001"]; // should actually be 2015-09-01
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