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<?php $arr = array( '56'=>array('class_name'=>'22','name'=>'jack','date'=>'2014'), '61'=>array('class_name'=>'33','name'=>'mary','date'=>'2012'), '57'=>array('class_name'=>'24','name'=>'lilei','date'=>'2015') ); uasort($arr, function($a, $b) { if( $a['class_name'] === $b['class_name'] ){ return $a['date'] - $b['date']; } return $a['class_name'] - $b['class_name']; }); print_r($arr);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [56] => Array ( [class_name] => 22 [name] => jack [date] => 2014 ) [57] => Array ( [class_name] => 24 [name] => lilei [date] => 2015 ) [61] => Array ( [class_name] => 33 [name] => mary [date] => 2012 ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [56] => Array ( [class_name] => 22 [name] => jack [date] => 2014 ) [57] => Array ( [class_name] => 24 [name] => lilei [date] => 2015 ) [61] => Array ( [class_name] => 33 [name] => mary [date] => 2012 ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/KQMGo on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/KQMGo on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/KQMGo on line 9
Process exited with code 255.

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