What are the differences between the three jump methods U(), redirect() and success() in ThinkPHP? ?

What are the differences between the three jump methods U(), redirect() and success() in ThinkPHP? ?

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What are the differences between the three jump methods U(), redirect() and success() in ThinkPHP? ?

uThe assistant function is to generate the URL and does not involve the jump function.
The difference between success and redirect is that the former has a smiley face pattern on the jump template, and there is no other difference.
You can find the answer by looking at the source code of tp

U function is used to generate URL.
The public redirect function is used to redirect URLs.
The redirect method in the controller is also used to redirect the URL. You can specify the jump time and jump text.
The success method in the controller is the same as redirect, but with a :) smiley face.
The error method in the controller is the same as redirect, but there is a :( crying face

If it is inconvenient to read here, please visit the difference between U function and redirect and success methods in ThinkPHP.

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Before I do this, I want to correct your description, UThis is not called a method, it is called a function.
For the differences between the three, we can take a look at the source code of thinkphp.

U function

/**
 * URL组装 支持不同URL模式
 * @param string $url URL表达式，格式：'[模块/控制器/操作#锚点@域名]?参数1=值1&参数2=值2...'
 * @param string|array $vars 传入的参数，支持数组和字符串
 * @param string|boolean $suffix 伪静态后缀，默认为true表示获取配置值
 * @param boolean $domain 是否显示域名
 * @return string
 */
function U($url = '', $vars = '', $suffix = true, $domain = false)
{
//省略
}

In fact, his comments have already made it very clear. The return value is a string type, and in fact, what is returned is the generated URL.
It is not an action, just an auxiliary function.

success method

    /**
     * 操作错误跳转的快捷方法
     * @access protected
     * @param string $message 错误信息
     * @param string $jumpUrl 页面跳转地址
     * @param mixed $ajax 是否为Ajax方式 当数字时指定跳转时间
     * @return void
     */
    protected function error($message = '', $jumpUrl = '', $ajax = false)
    {
        $this->dispatchJump($message, 0, $jumpUrl, $ajax);
    }

    /**
     * 操作成功跳转的快捷方法
     * @access protected
     * @param string $message 提示信息
     * @param string $jumpUrl 页面跳转地址
     * @param mixed $ajax 是否为Ajax方式 当数字时指定跳转时间
     * @return void
     */
    protected function success($message = '', $jumpUrl = '', $ajax = false)
    {
        $this->dispatchJump($message, 1, $jumpUrl, $ajax);
    }

It can be clearly seen here that success and error are both encapsulated dispatchJump methods, the difference is the second parameter.
Let’s go to dispatchJump again.

 /**
     * 默认跳转操作 支持错误导向和正确跳转
     * 调用模板显示 默认为public目录下面的success页面
     * 提示页面为可配置 支持模板标签
     * @param string $message 提示信息
     * @param Boolean $status 状态
     * @param string $jumpUrl 页面跳转地址
     * @param mixed $ajax 是否为Ajax方式 当数字时指定跳转时间
     * @access private
     * @return void
     */
    private function dispatchJump($message, $status = 1, $jumpUrl = '', $ajax = false)
    {
        if (true === $ajax || IS_AJAX) {
            // AJAX提交
            $data           = is_array($ajax) ? $ajax : array();
            $data['info']   = $message;
            $data['status'] = $status;
            $data['url']    = $jumpUrl;
            $this->ajaxReturn($data);
        }
        if (is_int($ajax)) {
            $this->assign('waitSecond', $ajax);
        }

        if (!empty($jumpUrl)) {
            $this->assign('jumpUrl', $jumpUrl);
        }

        // 提示标题
        $this->assign('msgTitle', $status ? L('_OPERATION_SUCCESS_') : L('_OPERATION_FAIL_'));
        //如果设置了关闭窗口，则提示完毕后自动关闭窗口
        if ($this->get('closeWin')) {
            $this->assign('jumpUrl', 'javascript:window.close();');
        }

        $this->assign('status', $status); // 状态
        //保证输出不受静态缓存影响
        C('HTML_CACHE_ON', false);
        if ($status) {
            //发送成功信息
            $this->assign('message', $message); // 提示信息
            // 成功操作后默认停留1秒
            if (!isset($this->waitSecond)) {
                $this->assign('waitSecond', '1');
            }

            // 默认操作成功自动返回操作前页面
            if (!isset($this->jumpUrl)) {
                $this->assign("jumpUrl", $_SERVER["HTTP_REFERER"]);
            }

            $this->display(C('TMPL_ACTION_SUCCESS'));
        } else {
            $this->assign('error', $message); // 提示信息
            //发生错误时候默认停留3秒
            if (!isset($this->waitSecond)) {
                $this->assign('waitSecond', '3');
            }

            // 默认发生错误的话自动返回上页
            if (!isset($this->jumpUrl)) {
                $this->assign('jumpUrl', "javascript:history.back(-1);");
            }

            $this->display(C('TMPL_ACTION_ERROR'));
            // 中止执行  避免出错后继续执行
            exit;
        }
    }

We see that there is no jump code here, it just loads the template, registers a few template variables and displays it.
So where does it jump? Obviously, it's on the template. Let’s go to the default template and take a look:

(function(){
var wait = document.getElementById('wait'),href = document.getElementById('href').href;
var interval = setInterval(function(){
    var time = --wait.innerHTML;
    if(time <= 0) {
        location.href = href;
        clearInterval(interval);
    };
}, 1000);
})();

You can see that the jump is made through location.href of javascript. That is, it is a jump implemented by the client.

redirect method

    /**
     * Action跳转(URL重定向） 支持指定模块和延时跳转
     * @access protected
     * @param string $url 跳转的URL表达式
     * @param array $params 其它URL参数
     * @param integer $delay 延时跳转的时间 单位为秒
     * @param string $msg 跳转提示信息
     * @return void
     */
    protected function redirect($url, $params = array(), $delay = 0, $msg = '')
    {
        $url = U($url, $params);
        redirect($url, $delay, $msg);
    }

We can see that the redirect method first uses the U function to obtain the address as a parameter and passes it to the redirect function. It is an encapsulation of this function.
Let’s go to the redirect function again.

/**
 * URL重定向
 * @param string $url 重定向的URL地址
 * @param integer $time 重定向的等待时间（秒）
 * @param string $msg 重定向前的提示信息
 * @return void
 */
function redirect($url, $time = 0, $msg = '')
{
    //多行URL地址支持
    $url = str_replace(array("\n", "\r"), '', $url);
    if (empty($msg)) {
        $msg = "系统将在{$time}秒之后自动跳转到{$url}！";
    }

    if (!headers_sent()) {
        // redirect
        if (0 === $time) {
            header('Location: ' . $url);
        } else {
            header("refresh:{$time};url={$url}");
            echo ($msg);
        }
        exit();
    } else {
        $str = "<meta http-equiv='Refresh' content='{$time};URL={$url}'>";
        if (0 != $time) {
            $str .= $msg;
        }

        exit($str);
    }
}

You can see a very short function with two server-side jump methods, respectively used to determine whether the http header has been output. It's a server-side jump.

Summary

The

U function will only be used to generate a url and will not perform a jump. The
success method itself will not jump, but because the default template has jump javascript code. The
redirect method is a jump made by the called server-side function.

See thinkPHP’s official documentation