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PHP主动断开与浏览器的连接

Jun 06, 2016 pm 07:45 PM
p php about disconnect Browser connect

曾经整理过一篇《关于PHP连接处理中set_time_limit()、connection_status()和ignore_user_abort()深入解析》,是讲解浏览器客户端断开时,服务器PHP脚本的处理。 这篇文章,将讲解一下服务器PHP脚本怎样主动断开与浏览器的连接,主要方法是使用http协议heade

曾经整理过一篇《关于PHP连接处理中set_time_limit()、connection_status()和ignore_user_abort()深入解析》,是讲解浏览器客户端断开时,服务器PHP脚本的处理。

这篇文章,将讲解一下服务器PHP脚本怎样主动断开与浏览器的连接,主要方法是使用http协议header中的Content-Length和Connection

Content-Length的作用:浏览器接收到指定Content-Length大小的消息实体后,则会断开与服务器的连接。
Connection的作用:浏览器接收到Connection的Close或Keep-Alive后,决定是关闭连接还是继续使用当前的连接进下一次请求。

<?php /**
    * 自动断开与浏览器的连接
    * jiaofuyou
    */

    echo &#39;1234567890&#39;;  //向浏览器输出的内容

    {//断开连接的代码  
        $size=ob_get_length();  
        header("Content-Length: $size");  //告诉浏览器数据长度,浏览器接收到此长度数据后就不再接收数据
        header("Connection: Close");      //告诉浏览器关闭当前连接,即为短连接
        ob_flush();  
        flush();  
    }  
    
    error_log(date("[Y-m-d H:i:s]")." > "."start" ."\n", 3 , "/usr/local/apache2219/logs/php_log");
    
    //断开连接后的执行长时间操作      
    sleep(5);  
    
    echo 'test213';//浏览器接收不到了  
    
    error_log(date("[Y-m-d H:i:s]")." > "."end"   ."\n", 3 , "/usr/local/apache2219/logs/php_log");
    //可以查看错误日志是否延迟5秒后执行. 

?>

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说明:

1、单独使用Content-length实际上连接并未断开,仅是浏览器停止接收信息,Connection: Close才是真正的告诉浏览器关闭连接。
2、指定Content-Length 对于 file_get_contents 没有任何意义;若想使用,请用curl。


如果想让PHP不停的向浏览器输出内容:

echo "1234567890"
ob_flush();
flush();

这样是不会立刻输出到浏览器的,可以这样

echo "1234567890
     "
//有换行时会立刻输出到浏览器
ob_flush();
flush();

或者:

echo "1234567890"
print str_pad("",10000);  //输出足够多的内容
ob_flush();
flush();
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