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run code in 150+ php & hhvm versions
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<?php $gatos = array( array( "id" => 1, "name" => "Titus", "fecha" => "2013-05-14 00:00:00", ), array( "id" => 2, "name" => "Gato", "fecha" => "2010-08-11 00:00:00", ), array( "id" => 3, "name" => "Pepito", "fecha" => "2011-02-28 00:00:00", ), array( "id" => 4, "name" => "Juancito", "fecha" => "2008-05-30 00:00:00", ), ); usort($gatos, function($gato1,$gato2){ return strcmp(date_create($gato1["fecha"])->format("md"),date_create($gato2["fecha"])->format("md")); }); var_dump($gatos);
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> array(3) { ["id"]=> int(3) ["name"]=> string(6) "Pepito" ["fecha"]=> string(19) "2011-02-28 00:00:00" } [1]=> array(3) { ["id"]=> int(1) ["name"]=> string(5) "Titus" ["fecha"]=> string(19) "2013-05-14 00:00:00" } [2]=> array(3) { ["id"]=> int(4) ["name"]=> string(8) "Juancito" ["fecha"]=> string(19) "2008-05-30 00:00:00" } [3]=> array(3) { ["id"]=> int(2) ["name"]=> string(4) "Gato" ["fecha"]=> string(19) "2010-08-11 00:00:00" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/Z0oVH on line 26
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 T_FUNCTION in /in/Z0oVH on line 26
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Z0oVH on line 26
Process exited with code 255.