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<?php $array = array(array('date'=>'2014-12-01', 'price'=>'123.00'), array('date'=>'2013-12-01', 'price'=>'123.00'), array('date'=>'2014-02-01', 'price'=>'123.00'), array('date'=>'2014-03-01', 'price'=>'123.00')); var_dump($array); function date_compare($a, $b) { $t1 = strtotime($a[$key]); $t2 = strtotime($b[$key]); return $t1 - $t2; } usort($array, 'date_compare'); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> array(2) { ["date"]=> string(10) "2014-12-01" ["price"]=> string(6) "123.00" } [1]=> array(2) { ["date"]=> string(10) "2013-12-01" ["price"]=> string(6) "123.00" } [2]=> array(2) { ["date"]=> string(10) "2014-02-01" ["price"]=> string(6) "123.00" } [3]=> array(2) { ["date"]=> string(10) "2014-03-01" ["price"]=> string(6) "123.00" } } Warning: Undefined variable $key in /in/8uk91 on line 8 Warning: Undefined array key "" in /in/8uk91 on line 8 Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/8uk91 on line 8 Warning: Undefined variable $key in /in/8uk91 on line 9 Warning: Undefined array key "" in /in/8uk91 on line 9 Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/8uk91 on line 9 Warning: Undefined variable $key in /in/8uk91 on line 8 Warning: Undefined array key "" in /in/8uk91 on line 8 Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/8uk91 on line 8 Warning: Undefined variable $key in /in/8uk91 on line 9 Warning: Undefined array key "" in /in/8uk91 on line 9 Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/8uk91 on line 9 Warning: Undefined variable $key in /in/8uk91 on line 8 Warning: Undefined array key "" in /in/8uk91 on line 8 Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/8uk91 on line 8 Warning: Undefined variable $key in /in/8uk91 on line 9 Warning: Undefined array key "" in /in/8uk91 on line 9 Deprecated: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/8uk91 on line 9 array(4) { [0]=> array(2) { ["date"]=> string(10) "2014-12-01" ["price"]=> string(6) "123.00" } [1]=> array(2) { ["date"]=> string(10) "2013-12-01" ["price"]=> string(6) "123.00" } [2]=> array(2) { ["date"]=> string(10) "2014-02-01" ["price"]=> string(6) "123.00" } [3]=> array(2) { ["date"]=> string(10) "2014-03-01" ["price"]=> string(6) "123.00" } }

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