php implicit flush,PHP ob_implicit_flush 用法手册 | 示例代码

MireskaSunbreeze

于 2021-03-19 13:07:43 发布

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文章标签： php implicit flush

这篇博客讨论了PHP中的ob_implicit_flush函数在Linux环境下不按预期工作的问题，特别是在命令行脚本中的表现。在PHP 4.3.3之前的版本以及PHP 5 beta1中，该函数在命令行环境中无法实现预期的flush效果，所有输出会在脚本结束时一次性发送。作者提供了一个使用ob_end_flush和ob_flush作为工作绕过的示例代码。这个信息对于遇到类似问题的PHP开发者来说是很有帮助的。

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######### BEWARE ##########

There is a bug (or at least an unexpected feature of ob_implicit_flush) that has been already discussed on the PHP bugtracker :

Code like this WILL NOT work :

// This will not work as expected on Linux.

ob_implicit_flush (1);

for($i=0;$i<10;$i++) {

echo "grrrrrrrrrrn";

sleep(1);

}

This feature happens on Linux versions of PHP, in all versions of php4 prior to 4.3.3 (don't know yet for the next ones) but also in php5 beta1. ob_implicit_flush has NO EFFECT on command-line (console, CLI) scripts, no flushing at all will be made, all output will be sent at the end of the script.

There is a workaround using ob_end_flush() and ob_flush, here it is :

// This works !

ob_end_flush();

for($i=0;$i<10;$i++) {

echo "yeah :-))))n";

@ob_flush();

sleep(1);

}

hope this will help. It would have helped me...