# collection格式化计算数据 有如下结构数组 ``` $gates = [ 'BaiYun_A_A17', 'BeiJing_J7', 'ShuangLiu_K203', 'HongQiao_A157', 'A2', 'BaiYun_B_B230' ]; ``` 请将它格式化后为如下数组： ``` $boards = [ 'A17', 'J7', 'K203', 'A157', 'A2', 'B230' ]; ``` ## 使用foreach循环解决这个问题 ``` $res = []; foreach($gates as $key => $gate) { if(strpos($gate, '_') === false) { $res[$key] = $gate; }else{ $offset = strrpos($gate, '_') + 1; $res[$key] = mb_substr($gate , $offset); } } var_dump($res); ``` ## 使用collection中的[map](/collections/map.md)和PHP中的explode与end方法 ``` collect($gates)->map(function($gate) { $parts = explode('_', $gate); return end($parts); }); ``` ## 使用collection中的[map](/collections/map.md)、expload、[last](/collections/last.md)和toArray方法 ``` collect($gates)->map(function($gate) { return collect(explode('_', $gate))->last(); })->toArray(); ```