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How to implement progress bar in php

藏色散人Original: 2020-09-01 10:19:383085browse

How to implement the progress bar in php: 1. Use "output buffer control" to directly output the progress bar; 2. Use ajax to first request the logical processing address, and then use session or other storage media to save the processing progress.

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There are two main ways to implement the progress bar in PHP. One is to use "output buffer control" to directly output the progress bar, and the other is the ajax method

Let me talk about it first. "Output buffer control" method:

This method mainly uses several buffer functions of PHP. This method can be run directly without changing the configuration file. The code is posted below:

<?php
set_time_limit(0);  //设置程序执行时间
ignore_user_abort(true);    //设置断开连接继续执行
header(&#39;X-Accel-Buffering: no&#39;);    //关闭buffer
header(&#39;Content-type: text/html;charset=utf-8&#39;);    //设置网页编码
ob_start(); //打开输出缓冲控制
echo str_repeat(&#39; &#39;,1024*4);    //字符填充
$width = 1000;
$html = &#39;<div style="margin:100px auto; padding: 8px; border: 1px solid gray; background: #EAEAEA; width: %upx"><div style="padding: 0; background-color: white; border: 1px solid navy; width: %upx"><div id="progress" style="padding: 0; background-color: #FFCC66; border: 0; width: 0px; text-align: center; height: 16px"></div></div><div id="msg" style="font-family: Tahoma; font-size: 9pt;">正在处理...</div><div id="percent" style="position: relative; top: -34px; text-align: center; font-weight: bold; font-size: 8pt">0%%</div></div>&#39;;
echo sprintf($html, $width+8, $width);
echo ob_get_clean();    //获取当前缓冲区内容并清除当前的输出缓冲
flush();   //刷新缓冲区的内容，输出
$length = 11;
for($i=0; $i<$length; $i++) {
    sleep(rand(1,2));
    $proportion = ($i+1)/$length;
    if($i+1 == $length){
        $msg = &#39;同步完成&#39;;
    }else{
        $msg = &#39;正在同步第&#39; . ($i+1) . &#39;个用户&#39;;
    }
    $script = &#39;<script>document.getElementById("percent").innerText="%u%%";document.getElementById("progress").style.width="%upx";document.getElementById("msg").innerText="%s";</script>&#39;;
    echo sprintf($script, intval($proportion*100), intval(($i+1)/$length)*$width, $msg);
    echo ob_get_clean();    //获取当前缓冲区内容并清除当前的输出缓冲
    flush();   //刷新缓冲区的内容，输出
}

Note : This progress bar style was found online. After a slight modification, you can replace it with the style you want.

"ajax method" is a little more troublesome. The logic of this method is to use ajax to request first. (Preferably an asynchronous request) The address of "logical processing". During the logical processing, use session or other storage media (such as memcache, redis, etc.) to save the processing progress, and use ajax to request (preferably a synchronous request) for another query. The address of the progress to achieve real-time feedback

The code is posted below:

The first is the html file

<!DOCTYPE html><html><head><meta charset="UTF-8"><script type="text/javascript" src="./jquery-1.10.2.min.js"></script><title>同步</title></head><body>
    <input type="button" name="syn" id="syn" value="同步" />
    <div id="progressBar" style="margin: 50px auto; padding: 8px; border: 1px solid gray; background: #EAEAEA; width: 1008px;display:none">
        <div style="padding: 0; background-color: white; border: 1px solid navy; width: 1000px">
            <div id="progress" style="padding: 0; background-color: #FFCC66; border: 0; width: 0px; text-align: center; height: 16px"></div>
        </div>
        <div id="msg">正在处理...</div>
        <div id="percent" style="position: relative; top: -18px; text-align: center; font-weight: bold; font-size: 8pt">0%</div>
    </div></body><script>function query(timestamp){
    $.ajax({
        type:&#39;post&#39;,
        url:&#39;/test1.php&#39;,   //查询进度
        data:{ timestamp:timestamp},
        dataType: "json",
        async:false,
        success: function(data){
            if(data.code==&#39;10000&#39;){
                data1 = data.data;
                document.getElementById("percent").innerText= data1.percent + "%";
                document.getElementById("progress").style.width=data1.progress + "px";
                document.getElementById("msg").innerText=data1.msg;                if(data1.percent == 100){
                    $("#syn").attr(&#39;disabled&#39;, false);                    return ;
                }
            }else{
                document.getElementById("msg").innerText=data.msg;
            }
            setTimeout(&#39;query(&#39; + timestamp + &#39;)&#39;, 1000);
        }
    });
}
$("#syn").click(function(){
    var timestamp = Date.parse(new Date());
    $("#syn").attr(&#39;disabled&#39;, &#39;disabled&#39;);
    $("#progressBar").css(&#39;display&#39;, &#39;block&#39;);
     $.ajax({
        type:&#39;post&#39;,
        url:&#39;/test.php&#39;,    //执行处理
        data:{ timestamp:timestamp},
        dataType: "json",
        async:true,
        success: function(data){
            if(data.code==&#39;10000&#39;){
                console.log(&#39;同步成功&#39;);                //data1 = data.data;
                //document.getElementById("percent").innerText= data1.percent + "%";
                //document.getElementById("progress").style.width=data1.progress + "px";
                //document.getElementById("msg").innerText=data1.msg;
            }else{
                document.getElementById("msg").innerText=data1.msg;
            }
        }
    }); 
    setTimeout(&#39;query(&#39; + timestamp + &#39;)&#39;, 1000);
});</script></html>

test.php
<?php
set_time_limit(0);  //设置程序执行时间
ignore_user_abort(true);    //设置断开连接继续执行
$timestamp = $_POST[&#39;timestamp&#39;];   //省略一切校验
$width = 1000;
$length = 11;
for($i=0; $i<$length; $i++) {
    sleep(rand(1,2));    //模拟处理时间
    $proportion = ($i+1)/$length;
    if($i+1 == $length){
        $msg = &#39;同步完成&#39;;
    }else{
        $msg = &#39;正在同步第&#39; . ($i+1) . &#39;个用户&#39;;
    }
    $data = array(
        &#39;percent&#39; => intval($proportion*100),
        &#39;progress&#39; => intval($width*($i+1)/$length),
        &#39;msg&#39; => $msg
    );
    session_start();
    $_SESSION[&#39;now_percent&#39; . $timestamp] = $data;
    session_write_close();  //释放session锁
}
echo json_encode(array(
    &#39;code&#39; => 10000,
    &#39;data&#39; => $data
));

test1.php
<?php
//忽略所有校验，直接写主要部分
$timestamp = $_POST[&#39;timestamp&#39;];   //省略一切校验
session_start();
$now_percent = @$_SESSION[&#39;now_percent&#39; . $timestamp];
session_write_close();
if(empty($now_percent)){
    echo json_encode(array(
        &#39;code&#39; => 10001,
        &#39;msg&#39; => &#39;正在处理...&#39;
    ));exit;
}else{
    echo json_encode(array(
        &#39;code&#39; => 10000,
        &#39;data&#39; => $now_percent
    ));exit;
}

Note: 1. The reason why setinterval is not used to check regularly and setTimeout is used is because if If the set time is too short, and the request response time is too long, the display will be confused

2.
Be careful to release the session in time after using it, otherwise the query will keep waiting because the session is locked. It is best to release it after use

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