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<?php $array = [ "a" => ['keycode' => '0001','date' => "2015-09-08"], "b" => ['keycode' => '0002','date' => "2015-09-05"], "c" => ['keycode' => '0003','date' => "2002-12-04"], "d" => ['keycode' => '0001','date' => "2015-09-01"], "e" => ['keycode' => '0001','date' => "2015-10-01"] ]; $needle = '0001'; $earliest = null; foreach ($array as $row) { if ($row['keycode'] === $needle && (!$earliest || $row['date'] < $earliest)) { $earliest = $row['date']; } } echo $earliest ?? "No qualifying rows for $needle";
Output for git.master, git.master_jit, rfc.property-hooks
2015-09-01

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