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PHP infinite classification (recursive)

2022-04-21 07:54:00 【Mars Murong】

public function Tree($arr, $pid = 0, $level = 0)
    {
        static $list = [];
        foreach ($arr as $key => $value) {
            if ($value["pid"] == $pid) {
                $value["level"] = $level;
                $list[] = $value;
                unset($arr[$key]); // Delete the data that has been arranged in order to reduce the number of iterations , Of course, recursion itself is very troublesome 
                $this->Tree($arr, $value["id"], $level + 1);
            }
        }
        return $list;

    }

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https://yzsam.com/2022/04/202204210629261939.html