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PHP提升echo, printf, print, file

Jun 06, 2016 pm 07:40 PM
echo file php print printf promote

让ECHO变快, 让PHP的请求处理过程, 尽快结束, 之所以ECHO慢, 是在等待写数据成功返回, 那么一个比较简单的办法, 就是打开输出缓存, 编辑php.ini output_buffering = 4096 // bytes 也可以在脚本中, 显示的调用ob_start(): ob_start (); echo $huge_string ;

让ECHO变快, 让PHP的请求处理过程, 尽快结束, 之所以ECHO慢, 是在等待”写数据”成功返回, 那么一个比较简单的办法, 就是打开输出缓存,

编辑php.ini

output_buffering = <span>4096</span> <span>//</span><span>bytes</span>
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也可以在脚本中, 显示的调用ob_start():

<span>ob_start</span><span>();
</span><span>echo</span> <span>$huge_string</span><span>;
</span><span>//</span><span>其他的逻辑.</span>
<span>ob_end_flush</span>();
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要注意的地方, ob_start将会开辟一块4096大小的buffer, 所以, 如果huge_string大于4096, 将不会起到加速的作用.

现在, 我们的ECHO就会”立即”执行成功, 返回. 因为数据暂时写到了我们的输出缓存当中. 如果buffer足够大, 那么内容会等到脚本的最后, 才一次性发送给客户端(严格来说, 是发送给WebServer). 但这样并不能解决我们今天遇到的这个问题, 因为这些数据到最后, 还是需要PHP去把它们发送给客户端(此时不考虑WebServer的Output buffer), 这个过程不结束, 请求不会关闭, PHP也不会执行DB的析构函数.

我们的PHP要输出100K的数据, 那么, 我们Apache的的输出缓存就必须大于100K, 否则当Apache的输出缓存满了以后, 就会真正的发送给客户端, 而这个过程中, 当时执行的ECHO就会阻塞等待.

那么, 如何修改Apache的输出缓存呢? 我们可以在apache的配置文件中, 使用SendBufferSize配置指令

SendBufferSize <span>4096</span> <span>//</span><span>注意是byte</span>
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具体的SendBufferSize的说明, 参看http://httpd.apache.org/docs/2.0/en/mod/mpm_common.html#sendbuffersize

注: 其他的Webserver with php-cgi的模式, 请翻阅相关Webserver的手册, 寻找类似配置.

现在, PHP的ECHO, 将直接把内容交给Apache, PHP在执行完成后, 不再等待内容发送给客户端完成, 而直接退出. 而内容会在PHP处理完成以后, 由Apache发送给客户端. 从而加速了ECHO的执行效率.

printf, print, file_put_contents(“php://output”)…等等, 和ECHO都是一样的.

最后要说明, 这样做, 只是把原来ECHO的等待时间, 转移给了Apache, 并没有真正的减少客户端获取到内容的时间. 它只是加速了PHP的处理过程, 提前了PHP的退出时机, 从而能减少PHP对资源的占用时间, 间接增加资源的占用率.

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