调用echo后，PHP刷新输出 [英] PHP flushing output as soon as you call echo

问题描述

我认为flush();可以工作，至少从Google/Stackoverflow告诉我的内容来看，但是在我的Windows WAMP(Windows，Apache，MySQL，PHP)系统上，这是行不通的.

是否需要设置一些PHP设置才能使flush()工作?

这是我的代码:

<?php
echo "Fun";

flush();

sleep(5);

echo "<br>Mo";
?>

当脚本执行完毕(5秒后)时，代码将全部输出在一起.我不希望这样，我想立即显示"Fun"，然后在5秒钟后显示"Mo". /p>

我尝试了其他刷新组合，例如ob_end_flush(); or ob_implicit_flush(true);，但没有任何效果.有什么想法吗?

解决方案

脚本在CLI上运行良好，显示"Fun"，等待5秒钟，然后显示< br> Mo".

对于浏览器，结果可能会有所不同，因为:

1. 浏览器不会立即开始渲染.为HTML文档获取3个字节的数据还不足以做任何事情，因此很可能还要再等几个.
2. lib级别的隐式IO缓冲很可能一直处于活动状态，直到收到换行符为止.

要解决此问题，请执行以下操作:1)使用文本/纯文本内容类型进行测试； 2)需要换行符，因此echo "Fun\n";和echo "<br>Mo\n";当然也不会对真实的HTML数据使用text/plain.

I thought flush(); would work, at least from what Google/Stackoverflow tell me, but on my Windows WAMP (Windows, Apache, MySQL, PHP) system it doesn't work.

Is there some PHP setting I have to set to make flush() work?

Here's my code:

<?php
echo "Fun";

flush();

sleep(5);

echo "<br>Mo";
?>

The code just outputs all together when the script is done executing (after 5 seconds).. I don't want this, I want 'Fun' to show up right away, and then after 5 seconds 'Mo'.

I've tried other combinations of flush like ob_end_flush(); or ob_implicit_flush(true); but nothing is working. Any ideas?

解决方案

The script works fine from CLI, displaying "Fun", waiting 5 secs before displaying "<br>Mo".

For a browser the results might be a bit different because:

1. The browser wont start rendering right away. Getting 3 bytes of data for HTML document isn't enough to do anything, so it'll most likely wait for a few more.
2. Implicit IO buffering on the lib level will most likely be active until a newline is received.

To work around 1) use text/plain content type for your test; 2) needs newlines, so do an echo "Fun\n"; and echo "<br>Mo\n"; Of course you wont be using text/plain for real HTML data.

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