ThinkPHP实现递归无级分类代码少,thinkphp递归
ThinkPHP实现递归无级分类——代码少,thinkphp递归
具体代码如下:
/** * 无级递归分类 * @param int $assortPid 要查询分类的父级id * @param mixed $tag 上下级分类之间的分隔符 * @return string $tree 返回的分类树型结构结果 * */ function recursiveAssort($assortPid, $tag = '') { $assort = M('goods_class')->where("class_pid = $assortPid")->field('class_id, class_name')->select(); foreach ($assort as $value) { $tree .= '<option value="' . $value['class_id'] . '">' . $tag . $value['class_name'] . '</option>'; $tree .= recursiveAssort($value['class_id'], $tag . ' '); } return $tree; }
以上代码就是用ThinkPHP实现递归无级分类的全部内容,希望大家喜欢。

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The recursion depth of C++ functions is limited, and exceeding this limit will result in a stack overflow error. The limit value varies between systems and compilers, but is usually between 1,000 and 10,000. Solutions include: 1. Tail recursion optimization; 2. Tail call; 3. Iterative implementation.

Yes, C++ Lambda expressions can support recursion by using std::function: Use std::function to capture a reference to a Lambda expression. With a captured reference, a Lambda expression can call itself recursively.

To run the ThinkPHP project, you need to: install Composer; use Composer to create the project; enter the project directory and execute php bin/console serve; visit http://localhost:8000 to view the welcome page.

ThinkPHP has multiple versions designed for different PHP versions. Major versions include 3.2, 5.0, 5.1, and 6.0, while minor versions are used to fix bugs and provide new features. The latest stable version is ThinkPHP 6.0.16. When choosing a version, consider the PHP version, feature requirements, and community support. It is recommended to use the latest stable version for best performance and support.

Steps to run ThinkPHP Framework locally: Download and unzip ThinkPHP Framework to a local directory. Create a virtual host (optional) pointing to the ThinkPHP root directory. Configure database connection parameters. Start the web server. Initialize the ThinkPHP application. Access the ThinkPHP application URL and run it.

The recursive algorithm solves structured problems through function self-calling. The advantage is that it is simple and easy to understand, but the disadvantage is that it is less efficient and may cause stack overflow. The non-recursive algorithm avoids recursion by explicitly managing the stack data structure. The advantage is that it is more efficient and avoids the stack. Overflow, the disadvantage is that the code may be more complex. The choice of recursive or non-recursive depends on the problem and the specific constraints of the implementation.

To optimize the performance of recursive functions, you can use the following techniques: Use tail recursion: Place recursive calls at the end of the function to avoid recursive overhead. Memoization: Store calculated results to avoid repeated calculations. Divide and conquer method: decompose the problem and solve the sub-problems recursively to improve efficiency.

ThinkPHP installation steps: Prepare PHP, Composer, and MySQL environments. Create projects using Composer. Install the ThinkPHP framework and dependencies. Configure database connection. Generate application code. Launch the application and visit http://localhost:8000.
