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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 sortByDate($a, $b) { return $a['date'] - $b['date']; } usort($array, 'sortByDate'); 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: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 Warning: A non-numeric value encountered in /in/aS3mP on line 7 array(4) { [0]=> array(2) { ["date"]=> string(10) "2013-12-01" ["price"]=> string(6) "123.00" } [1]=> array(2) { ["date"]=> string(10) "2014-12-01" ["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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