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run code in 150+ php & hhvm versions
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<?php $arr = Array ( Array( "2014-05-31" => "value1" ), Array ( "2014-04-17" => "value2" ), Array ( "2014-04-21" => "value 3" ) ); $res = usort($arr, function($a, $b){ $a_time = array_keys($a); $par1 = strtotime($a_time[0]); $b_time = array_keys($b); $par2 = strtotime($b_time[0]); if ($par1 == $par2) { return 0; } return ($par1 < $par2) ? -1 : 1; }); print_r($arr); ?>
Output for 5.3.0 - 7.1.0
Array ( [0] => Array ( [2014-04-17] => value2 ) [1] => Array ( [2014-04-21] => value 3 ) [2] => Array ( [2014-05-31] => value1 ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/3fRbP on line 13
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/3fRbP on line 13
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/3fRbP on line 13
Process exited with code 255.