为什么post 提交后，还没执行 Ajax 就报500错，什么原因呢？

Question

*reset_pwd.js*

;
var user_resetPwd_opt = {
    init: function(){
        this.bindEvent();
    },
    bindEvent: function(){
        var that = this;
        $("#save").click(function(){
            var btn_target  = $(this);
            if( btn_target.hasClass("disabled") ){
                alert("正在处理，请不要频繁点击~~");
                return;
            }

            var old_password = $("#old_password").val();
            if(!old_password){
                alert("请输入原密码~~",$("#old_password"));
                return false;
            }

            var new_password = $("#new_password").val();
            if(!new_password || new_password.length<6){
                alert("请输入不少于6位的新密码！",$("#new_password") );
                return false;
            }

            btn_target.addClass("disabled");

            var data = {
                'old_password':$("#old_password").val(),
                'new_password':$("#new_password").val()
            };

            //执行到这里，就不往下执行了，ajax方法中都不进去，然后报 500 错
            $.ajax({
                url:'/web/user/reset-pwd',
                type:'POST',
                data:data,
                dataType:'json',
                success:function(res){
                    console.log(res);
                    btn_target.removeClass("disabled");
                    var callback = null;
                    if( res.code == 200 ){
                        callback = function(){
                            window.location.href = window.location.href;
                        }
                    }
                    common_ops.alert( res.msg,callback );
                }
            });
        });
    }
};

$(function(){
    user_resetPwd_opt.init();
});

*php 接口文件*

//修改密码，这个接口方法也不执行！！！根本进不来
    public function actionResetPwd(){

        if( \Yii::$app->request->isGet){
            return $this->render("reset_pwd",[
                'info' => $this->current_user
            ]);
        }

        $old_password = trim($this->post('old_password',''));
        $new_password = trim($this->post('new_password',''));

        var_dump($old_password);
        if(!$old_password){
            return $this->renderJSON([],"请输入原密码！",-1);
        }

        if( mb_strlen($new_password,"utf-8") < 6 ){
            return $this->renderJSON([],"请输入不少于6位的新密码！",-1);
        }

        if($old_password == $new_password){
            return $this->renderJSON([],"请重新输入一个吧，新密码和原密码不能相同哦！",-1);
        }

        $current_user = $this->current_user;
        if (!$current_user->verifyPassword($old_password)) {
            return $this->renderJSON([],"请检查原密码是否正确~~",-1);
        }

        if( $current_user['uid'] == 2 ){
            return $this->renderJSON([],"该账号为测试账号，请不要修改密码~~",-1);
        }

        $current_user->setPassword($new_password);
        $current_user->updated_time = date("Y-m-d H:i:s");
        $current_user->update(0);

        $this->setLoginStatus( $current_user );

        return $this->renderJSON([],"修改成功~~");
    }

以下为返回的 500 提示信息，网上找了好久了，都没有找到对应的解决办法：

Request URL: http://localhost/web/user/reset-pwd
Request Method: POST
Status Code: 500 Internal Server Error
Remote Address: [::1]:80
Referrer Policy: no-referrer-when-downgrade

Connection: close
Content-Length: 1086
Content-Type: text/html; charset=UTF-8
Date: Wed, 07 Aug 2019 14:34:05 GMT
Server: Apache/2.4.39 (Win64) PHP/7.2.18
X-Debug-Duration: 52
X-Debug-Link: /debug/default/view?tag=5d4ae15d5a12f
X-Debug-Tag: 5d4ae15d5a12f
X-Powered-By: PHP/7.2.18

Accept: application/json, text/javascript, */*; q=0.01
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cache-Control: no-cache
Connection: keep-alive
Content-Length: 43
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Cookie: _csrf=c0529d0c9fadbedf960423cd3d1160852fa4528d1ca9477ae5b7ecc462d6dd47a%3A2%3A%7Bi%3A0%3Bs%3A5%3A%22_csrf%22%3Bi%3A1%3Bs%3A32%3A%22zOrm1uMkflCmSJt-e64VkAsVzHNAqA7U%22%3B%7D; SL_G_WPT_TO=zh-CN; SL_GWPT_Show_Hide_tmp=undefined; SL_wptGlobTipTmp=undefined; mooc_book=117caee042eb7b1cb219735ee3732fe9aa7ebf78321d05c7a78b8a62739d9e24a%3A2%3A%7Bi%3A0%3Bs%3A9%3A%22mooc_book%22%3Bi%3A1%3Bs%3A34%3A%22143af06bfcb66cc61e2f0aa96abfe0f5%231%22%3B%7D
Host: localhost
Origin: http://localhost
Pragma: no-cache
Referer: http://localhost/web/user/reset-pwd
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36
X-Requested-With: XMLHttpRequest
old_password: 123456
new_password: root123456

同样的方法，http://localhost/web/user/edit 就可以成功 post 。

Answer 1

1. 查看一下php-fpm.conf中的error_log的配置，到error log中查看能不能找到报错信息

2. ini_set("display_errors", "on");
   error_reporting(E_ALL);

   把这两句放在 actionResetPwd 方法里面，开启 报错，再请求查看一下报错信息

Answer 2

500接口发出去了 就是后台的锅了

Answer 3

你在下后台相对应接口地方打个断点，看下报什么错