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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, $key) { $t1 = strtotime($a[$key]); $t2 = strtotime($b[$key]); return $t1 - $t2; } usort($array, array('date_compare', 'date')); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> array(2) { ["date"]=> string(10) "2014-12-01" ["price"]=> string(6) "123.00" } [1]=> array(2) { ["date"]=> string(10) "2013-12-01" ["price"]=> string(6) "123.00" } [2]=> array(2) { ["date"]=> string(10) "2014-02-01" ["price"]=> string(6) "123.00" } [3]=> array(2) { ["date"]=> string(10) "2014-03-01" ["price"]=> string(6) "123.00" } } Fatal error: Uncaught TypeError: usort(): Argument #2 ($callback) must be a valid callback, class "date_compare" not found in /in/ZRXQS:12 Stack trace: #0 /in/ZRXQS(12): usort(Array, Array) #1 {main} thrown in /in/ZRXQS on line 12
Process exited with code 255.

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