更改SESSION变量以停止&"while循环&". [英] Change SESSION variable to stop "while loop"

问题描述

我是php的新手，我想使用按钮(启动/停止)控制php while循环脚本，启动按钮对定义了 start.php 脚本的ajax调用 $ _ SESSION ['loop'] = TRUE 并执行循环，停止按钮对 stop.php 脚本进行ajax调用，只需更改 $ _ SESSION ['loop'] 更改为 FALSE .

I'm new to php and I want to control a php while loop script, using buttons (start/stop), the start button make an ajax call to the start.php script that define $_SESSION['loop'] = TRUE and execute the loop, the stop button make an ajax call to the stop.php script that just change $_SESSION['loop'] to FALSE.

到目前为止，下面是我的代码，但是当我按下停止"按钮时，只有在while循环完成循环之后，我才发出警报(成功停止)，这意味着循环没有像我一样中断是在假设.

Below is my code so far, but when I hit the stop button I became the alert (success stop) only after the while loop finish looping, which mean the loop didn't break as I was assuming.

我认为这与会话在执行循环时被锁定有关.如果是这样，如何更改 $ _ SESSION ['loop'] 值并使循环每个时间读取该值?

I think it's something with the session that is locked while the loop is executing. If so, how to change the $_SESSION['loop'] value and make the loop read that value each time?

index.php

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function(){
        $('#start').click(function(){
            $.ajax({
                url: "start.php"
            });
        });

        $('#stop').click(function(){
            $.ajax({
                url: "stop.php",
                success: function(){
                    alert('success stop');
                },
                error: function(){
                    alert('failure stop');
                }
            });
        });
    });
</script>

<button id="start">Start</button>
<button id="stop">Stop</button>

start.php

<?php
    session_start();
    $_SESSION['loop'] = TRUE;

    ini_set('max_execution_time', 300);
    $i = 0;
    while($i < 100) {

        if ($_SESSION['loop'] == TRUE) {

            //query to save some variables

            // Pause 10s after saving 2
            if ($i != 0 && $i%2 == 0) {
                sleep(10);
            }

            $i++;

        } else {
            break;
        }
    }
?>

stop.php

<?php
    session_start();

    if(isset($_SESSION['loop'])) {
        $_SESSION['loop'] = FALSE;
    }
?>

推荐答案

您的启动和停止操作处于两个不同的会话中，因此在一个会话中更改$ SESSION不会对另一个会话造成任何影响.

Your start and stop operations are in two different sessions, so changing $SESSION in one makes no difference to the other.

这篇关于更改SESSION变量以停止&"while循环&".的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！