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run code in 150+ php & hhvm versions
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<?php $list = [ ['second', 'stamp' => time()], ['first', 'stamp' => time() - 10000], ['third', 'stamp' => time() + 10000], ['fourth', 'stamp' => time() + 5], ]; usort($list, function($a, $b) { return $a['stamp'] - $b['stamp']; }); var_dump($list);
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> array(2) { [0]=> string(5) "first" ["stamp"]=> int(1389204836) } [1]=> array(2) { [0]=> string(6) "second" ["stamp"]=> int(1389214836) } [2]=> array(2) { [0]=> string(6) "fourth" ["stamp"]=> int(1389214841) } [3]=> array(2) { [0]=> string(5) "third" ["stamp"]=> int(1389224836) } }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/pGqO5 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/pGqO5 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pGqO5 on line 3
Process exited with code 255.