php使用ob_flush不能每隔一秒输出原理分析_php技巧
本文实例讲述了php使用ob_flush不能每隔一秒输出原理。分享给大家供大家参考。具体分析如下:
实现功能:
浏览器每隔一秒输出一个数字。
php.ini配置为:
版本5.3
implicit_flush = off
output_buffering = off
另:查看output_buffering是否打开,可以:
好我们再来看看这段代码:
<?php $i = 3; ob_start(); while ($i--) { echo $i, "<br />"; ob_flush(); flush(); sleep(1); } ob_end_clean(); ?>
可为什么:这段代码不能每隔一秒输出呢??
原因分析:
apache运行原理:当你访问一个地址(发送请求)后,apache启动PHP,那么php执行是页面级的,即如果有可执行的代码:它全部执行完后再丢给apache,apache再丢给browser显示结果
如何实现?
如果是cli 显示结果方式又不一样,那里不一样呢?
linux cmd:
php5 test.php
由php直接执行,不经过apache,web service,就可以实现:
<?php $i = 3; while ($i--) { echo $i, "\n"; sleep(1); } ob_end_clean(); ?>
希望本文所述对大家的php程序设计有所帮助。

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