在如下场景中,我们总是希望能够在php中使用类似mysql的groupby操作:
SQL过于复杂,造成数据库运算效率低下
从数据库中读取出原始数据,在php中进行运算,增强代码重用率
其他非数据库场景的数组归并场景
对二维数组进行归并
归并的同时,支持对字段进行自定义处理
比SQL更灵活的自定义函数,你可以随意编写归并和字段合并函数
示例:
$records = [ ['order_date' => '2014-01-01', 'price' => 5], ['order_date' => '2014-01-02', 'price' => 10], ['order_date' => '2014-01-03', 'price' => 20], ['order_date' => '2015-01-04', 'price' => 25], ]; $group_by_fields = [ 'order_date' => function($value){ return date('Y', strtotime($value)); } ]; $group_by_value = [ 'order_date' => [ 'callback' => function($value_array){ return substr($value_array[0], 0, 4); }, 'as' => 'year' ], 'price' => function($data){ return array_sum(array_column($data, 'price')); }, ]; $grouped = \Jenner\Zebra\ArrayGroupBy::groupBy($records, $group_by_fields, $group_by_value); print_r($grouped);
结果:
Array ( [0] => Array ( [year] => 2014 [price] => 35 ) [1] => Array ( [year] => 2015 [price] => 25 ) )
举例
归并过程中,实现对结果的中值计算
归并过程中,对时间字段进行自定义处理,例如归并每5分钟的数据
等等
$records = [ ['bill_time'=>'2014-01-01 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-01 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-01 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-02 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-02 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-03 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-03 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-03 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-04 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-04 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-04 00:00:00', 'price'=>1, 'cnt'=>3,], ['bill_time'=>'2014-01-04 00:00:00', 'price'=>1, 'cnt'=>3,], ]; $group_by_fields = [ 'bill_time' => function($field){ return substr($field, 0, 10); } ]; $group_by_values = [ 'bill_time' => function($field_values){ return substr($field_values[0], 0, 10); }, 'price' => function($field_values){ return array_sum($field_values); }, 'cnt' => function($field_values){ return array_sum($field_values); } ]; $week_fields = [ 'bill_time' => function($field){ return date('w', strtotime($field)); } ]; $week_values = [ 'bill_time' => function($data){ return date('w', strtotime($data[0]['bill_time'])); }, 'price' => function($data){ return array_sum(array_column($data, 'price')); }, 'cnt' => function($data){ return array_sum(array_column($data, 'cnt')); } ]; $grouped = (new \Jenner\Zebra\ArrayGroupBy($records))->groupByField($group_by_fields)->groupByValue($group_by_values)->groupByField($week_fields)->groupByValue($week_values)->get(); print_r($grouped);