PHP主动断开与浏览器的连接
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 '1234567890'; //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. ?>
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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