public static function array_group_by($arr, $key) { $grouped = []; foreach ($arr as $value) { $grouped[$value[$key]][] = $value; } // Recursively build a nested grouping if more parameters are supplied // Each grouped array value is grouped according to the next sequential key if (func_num_args() > 2) { $args = func_get_args(); foreach ($grouped as $key => $value) { $parms = array_merge([$value], array_slice($args, 2, func_num_args())); $grouped[$key] = call_user_func_array('array_group_by', $parms); } } return $grouped; }
PHP二维数组内指定数组key进行分组
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