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php怎么实现异步

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Release: 2020-06-28 10:19:09
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php怎么实现异步

php怎么实现异步?

php使用异步的一种简单的方法就是使用fsockopen了, 它可以实现把耗时的任务丢给另外一个程序执行, 以至于不用浏览器一直在转圈圈(也就是一直在加载)

可以先把代码复制去执行一遍是什么效果吧, 代码如下:

注意: 下面的debug参数若为true则为用为调试,开启调试可以看到异步的执行情况,但是失去异步的效果

主php文件main.php:

<?php
function request_by_fsockopen($url,$post_data=array(),$debug=false){
    $url_array = parse_url($url);
    $hostname = $url_array[&#39;host&#39;];
    $port = isset($url_array[&#39;port&#39;])? $url_array[&#39;port&#39;] : 80;
    @$requestPath = $url_array[&#39;path&#39;] ."?". $url_array[&#39;query&#39;];
    $fp = fsockopen($hostname, $port, $errno, $errstr, 10);
    if(!$fp){
        echo "$errstr ($errno)";
        return false;
    }
    $method = "GET";
    if(!empty($post_data)){
        $method = "POST";
    }
    $header = "$method $requestPath HTTP/1.1\r\n";
    $header.="Host: $hostname\r\n";
    if(!empty($post_data)){
        $_post = strval(NULL);
        foreach($post_data as $k => $v){
            $_post[]= $k."=".urlencode($v);//必须做url转码以防模拟post提交的数据中有&符而导致post参数键值对紊乱
        }
        $_post = implode(&#39;&&#39;, $_post);
        $header .= "Content-Type: application/x-www-form-urlencoded\r\n";//POST数据
        $header .= "Content-Length: ". strlen($_post) ."\r\n";//POST数据的长度
        $header.="Connection: Close\r\n\r\n";//长连接关闭
        $header .= $_post; //传递POST数据
    }
    else{
        $header.="Connection: Close\r\n\r\n";//长连接关闭
    }
    fwrite($fp, $header);
    //-----------------调试代码区间-----------------
    //注如果开启下面的注释,异步将不生效可是方便调试
    if($debug){
        $html = &#39;&#39;;
        while (!feof($fp)) {
            $html.=fgets($fp);
        }
        echo $html;
    }
    //-----------------调试代码区间-----------------
    fclose($fp);
}
$data=array(&#39;name&#39;=>&#39;guoyu&#39;,&#39;pwd&#39;=>&#39;123456&#39;);
$url=&#39;http://localhost/test/other.php&#39;;
request_by_fsockopen($url,$data,true);
Copy after login

要异步执行的文件other.php:

<?php
header("content-type:text/html;charset=utf-8");
//error_reporting(0);
//ini_set(&#39;html_errors&#39;,false);
//ini_set(&#39;display_errors&#39;,false);
$name = isset($_POST[&#39;name&#39;])?$_POST[&#39;name&#39;]:&#39;&#39;;
$pwd = isset($_POST[&#39;pwd&#39;])?$_POST[&#39;pwd&#39;]:&#39;&#39;;
echo $name.$pwd;
echo &#39;success ok&#39;;
die;
Copy after login

若也想看到异步执行的效果, 可以的other.php内用文件来保存$name和$pwd信息, 如果想让效果更明显, 还可以再other.php文件内加个睡眠函数让它睡上几秒, 此时可以看到运行main.php秒结束, 但其实other.php还在运行(睡眠), 然后几秒后多了个文件, 则说明异步执行成功。

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