在脚本完成之前返回从php到ajax的响应 [英] return response to from php to ajax before script finishes

问题描述

我有一个简单的AJAX请求到PHP文件。一旦PHP脚本到达某一点，我希望响应完成并发送回客户端。之后我仍然需要PHP脚本来运行一个最多需要15秒的函数。目前，浏览器在处理响应之前等待整个PHP脚本完成。我曾尝试使用 flush（）; 或 ob_flush（）; ，但它仍然等待PHP脚本在发送响应之前完成运行。

I have a simple AJAX request that to a PHP file. Once the PHP script reaches a certain point I would like for the response to be completed and sent back to the client. After that I still need the PHP script to run a function that takes up to 15 seconds. Currently the browser waits for the entire PHP script to finish before processing the response. I have tried to use flush(); or ob_flush();, but it still waited for the PHP script to finish running before sending the response.

JQuery代码：

jQuery.ajax({
            url: "../phpFile.php",
            data: formdata,
            cache: false,
            contentType: false,
            processData: false,
            type: 'POST',
            success: function (data) {
                data = $.parseJSON(data);
                if(data.success){
                    window.location = "../public/dashboard.php";
                }
           }
});

PHP代码：

if ($script_reached_this_point) {

    // ob_start();
    echo json_encode(['success' => 'Ticket added']);
    //flush();
    //  ob_end_flush();

    run_15_second_function();

}

推荐答案

我解决了有两个PHP脚本的类似问题。我们称之为 receiver.php 和 worker.php 。流程如下：

I solved a similar problem by having 2 PHP scripts. Let's call them receiver.php and worker.php. The process is as follows:

1. AJAX调用 receiver.php


2. receiver.php 在辅助连接中调用 worker.php ，将作业指令传递给它并且等待第一行回复。


3. 第一行响应从 worker.php 到达时， receiver.php 关闭该连接


4. receiver.php 立即返回对AJAX的响应退出。


5. worker.php 继续在后台工作

1. AJAX calls receiver.php
2. receiver.php calls worker.php in a secondary connection, passes it the job instructions and waits for the first line of response.
3. As soon as the first line of response arrives from worker.php, receiver.php closes that connection
4. receiver.php returns the response to AJAX immediately and exits.
5. worker.php continues work in the background

receiver.php

//data to be forwarded to worker.php
$postData = json_encode($_POST);

// headers for the connection to worker.php
$headers =  "POST /path/to/worker.php HTTP/1.1".PHP_EOL;
$headers .= "Host: localhost".PHP_EOL;
$headers .= "Content-Length: ".strlen($postData).PHP_EOL;
$headers .= "Content-Encoding: none".PHP_EOL;
$headers .= "Content-Type: application/json".PHP_EOL;

// create socket to the local webserver for calling background script
$socketToWorker = fsockopen("localhost", 80, $errno, $err_msg);
if(!$socketToWorker) die("fsockopen error #$errno: $err_msg");

// Make the request and send the POST data
fwrite($socketToWorker, $headers.PHP_EOL.$postData);    

//read until the 1st packet is returned, then stop. 8192 is arbitrary
//but needs to be greater than the expected response from worker.php
$data = fread($socketToWorker,8192);
fclose($socketToWorker);

//send response to browser (work still ongoing in background)
if($data==='OK') echo "Success";
else echo "Background work failed. Error: $data";

worker.php

//parse input from receiver.php
$postData = json_decode(file_get_contents('php://input'),true);

//TODO: validate $postData. 

// If data is valid, set below to 'OK' to accept the job
$acceptJob = 'OK'; //replace with an error message to reject the job
ob_start(); //start the buffer
echo $acceptJob; //this is what receiver.php will see

//set headers for the response to receiver.php
header("Content-Encoding: none");
header('Connection: close');
header('Content-Length: '.ob_get_length() );

// flush buffer. Will cause receiver.php to receive data and disconnect
ob_end_flush(); ob_flush(); flush();

if($acceptJob!=='OK') exit;

##################### START THE JOB HERE #####################
set_time_limit(60); //only needed if you expect job to last more than 30 secs
run_15_second_function();

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