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<?php $arr = array( '56'=>array('class_name'=>'6','name'=>'jack','date'=>'2014'), '61'=>array('class_name'=>'2','name'=>'mary','date'=>'2012'), '57'=>array('class_name'=>'5','name'=>'lilei','date'=>'2015') ); uasort($arr, function($a, $b) { return $a['class_name'] - $b['class_name']; }); print_r($arr);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [61] => Array ( [class_name] => 2 [name] => mary [date] => 2012 ) [57] => Array ( [class_name] => 5 [name] => lilei [date] => 2015 ) [56] => Array ( [class_name] => 6 [name] => jack [date] => 2014 ) )

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