刷新PHP缓冲区为你的站点加速，刷新php缓冲区站点
刷新PHP缓冲区为你的站点加速，刷新php缓冲区站点
在当前 PHP 版本的默认配置下，“输出缓冲（Output Buffering）”是被打开的。旧版本则不是这样，在旧版本的 PHP 中，字符串在每次被输出的时候（通过 echo 或 print 函数），都会触发一次发送到客户端浏览器的动作。
“输出缓冲”的引入，使得这一过程更加快速、更加高效。缓冲区实际上是在内存中开辟了一块区域，可以认为是内存中的一个大的字符串。当程序中有字符要输出的时候，会把要输出的内容附加到该缓冲区中，用来替代旧版本 PHP 中每次都直接输出到浏览器的方式。当缓冲区被“刷新”的时候，再统一输入到用户浏览器。以下几种情况下，会引起缓冲区的“刷新”操作：
1、PHP 程序执行完毕；
2、缓存区的大小超过了 php.ini 配置文件中设置的 output_buffering 值；
3、flush() 或者 ob_flush() 函数被调用的时候。
在实际的产品环境下，我们可以通过在 head 标签后马上刷新 PHP 的缓冲区，来达到加速你的站点的目的，示例代码如下：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <title>Buffer flushing in action</title> <link rel="stylesheet" type="text/css" href="styles.css" /> <link rel="shortcut icon" href="favicon.ico" /> </head> <?php // 这里强制刷新缓冲区 flush(); ?> <body> ...
接下来来解释上述代码的作用：
当浏览器接收到页面 head 部分的代码的时候，就可以开始下载 head 段中的包括的资源了，类似 CSS 文件、站点收藏图标（Favicon）等。这些内容的下载可以与浏览器接受 body 段的内容时的时间同步进行。
具体能加速多少，需要因地制宜。这取决于很多客观条件，包括服务端的响应速度、你的页面大小、你的 CSS 文件大小和数量、浏览器是否有本地缓存等等。因素固然有很多，不过这样一个小小的优化，就可以显而易见的为你的站点加速，何乐而不为呢？
我很希望各位把这个小技巧运用在自己网站上，并跟踪所产生的实际效果。期待大家的反馈。
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