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<?php $a = json_encode(array('sleep' => 123)); $b = json_encode(array('sleep' => 987)); $logs = array(array('date' => '2014-01-01', 'data' => $a), array('date' => '2015-01-01', 'data' => $b)); $result = array_reduce($logs, function ($cur, $x) { $data = json_decode($x['data']); $cur[$x['date']] = $data->{'sleep'}; return $cur; }, array()); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["2014-01-01"]=> int(123) ["2015-01-01"]=> int(987) }

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