blocks|key|5077197|text|摘自PHP手册：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5077198|flush()可能无法覆盖web服务器的缓冲方案，并且它对浏览器中的任何客户端缓冲都没有影响。它也不会影响PHP的用户空间输出缓冲机制。这意味着您必须同时调用ob_flush()和flush()来刷新ob输出缓冲区(如果您正在使用它们)。|5077199|echo+"Hello!";
flush();
ob_flush();

for($i+=+0;+$i+<+10;+$i+%2B%2B)+{
++++echo+$i;
++++//5-10+sec+execution+time
++++flush();
++++ob_flush();
}|code-block|syntax|javascript|5077200|-或者-您可以刷新并关闭缓冲|5077201|<?php
//Flush+(send)+the+output+buffer+and+turn+off+output+buffering
while+(ob_get_level()+>+0)
++++ob_end_flush();

echo+"Hello!";

for($i+=+0;+$i+<+10;+$i+%2B%2B)+{
++++echo+$i+.+"\r\n";
}

?>|5077202|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

From PHP Manual: 

flush() may not be able to override the buffering scheme of your web server and it has no effect on any client-side buffering in the browser. It also doesn't affect PHP's userspace output buffering mechanism. This means you will have to call both ob_flush() and flush() to flush the ob output buffers if you are using those. 

<pre><code>echo "Hello!";
flush();
ob_flush();

for($i = 0; $i &lt; 10; $i ++) {
 echo $i;
 //5-10 sec execution time
 flush();
 ob_flush();
}
</code></pre>

-or- you can flush and turn off Buffering

<pre><code>&lt;?php
//Flush (send) the output buffer and turn off output buffering
while (ob_get_level() &gt; 0)
 ob_end_flush();

echo "Hello!";

for($i = 0; $i &lt; 10; $i ++) {
 echo $i . "\r\n";
}

?&gt;
</code></pre>

blocks|key|1391885|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1391886|while+(@ob_end_flush());++++++
ob_implicit_flush(true);

echo+"first+line+visible+to+the+browser";
echo+str_pad("",1024,"+");
echo+"<br+/>";

sleep(5);

echo+"second+line+visible+to+the+browser+after+5+secs";|code-block|syntax|javascript|1391887|只需注意，这种方式实际上是在禁用当前脚本的输出缓冲区。因此，如果您试图在此之后'ob_end_flush()‘，您将得到一个警告，没有缓冲区关闭。|1391888|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

try this

<pre><code>while (@ob_end_flush()); 
ob_implicit_flush(true);

echo "first line visible to the browser";
echo str_pad("",1024," ");
echo "&lt;br /&gt;";

sleep(5);

echo "second line visible to the browser after 5 secs";
</code></pre>

Just notice that this way you're actually disabling the output buffer for your current script. So if you're trying to 'ob_end_flush()' after that you'll get a warning that there is no buffer to close.

blocks|key|3293036|text|请确保您首先执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3293037|@ini_set('zlib.output_compression',+0);+@ini_set('implicit_flush',+1);+@ob_end_clean();|offset|length|style|CODE|3293038|然后只需在每次需要将回声输出到浏览器时使用flush();。|3293039|entityMap^0|0|0|2F|0|L|8|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

Make sure you first do:

<code>@ini_set('zlib.output_compression', 0);
@ini_set('implicit_flush', 1);
@ob_end_clean();</code>

and then just <code>flush();</code> every time you need to output your echo'es to the browser.

blocks|key|3292799|text|一般来说，使用纯和HTML的确定性/稳定的方式是不可能实现预期行为的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3292800|浏览器是否以及如何呈现部分页面取决于浏览器、代理和缓存。因此，即使这些东西在您的测试机器上工作，它也很可能不能在您的生产系统上运行。|3292801|xAjax库提供了一个集成的解决方案，用于使用PHP管理AJAX风格的更新。虽然xAjax作为一个项目可能已经死亡(至少现在是这样)，但它仍然工作得很好。|3292802|entityMap|0|LINK|mutability|MUTABLE|url|http://www.xajax-project.org/^0|8|D|0|0|B|F|0|5|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@$9|Y|A|Z|1|10]]|E|$]]|$1|J|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

In general, the desired behavior isn't possible is a deterministic/stable way using pure PHP and HTML.

If and how a browser renders a partial page depends on the browser, proxies and caches. Thus, even if the stuff works on your test machine, it's likely, that it does not on your production system.

The library <a href="http://www.xajax-project.org/" rel="nofollow">xAjax</a> provides a well-integrated solution to manage AJAX style updates with PHP. While xAjax might be dead as a project (at least right now), it still works fine.

blocks|key|3006639|text|您也可以尝试使用ob_flush()，有时两者都需要才能工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3006640|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You could try to also use ob_flush() sometimes both are needed to work.

blocks|key|3006999|text|还要确保先输出一个内容类型的头文件。法拉盛对我不起作用，除非：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3007000|header(+'Content-type:+text/html;+charset=utf-8'+);
for($i=0;+$i<10;+%2B%2B$i)++{
++++echo+"Loop<br+/>\n";
++++ob_flush();
++++flush();
++++sleep(1);
}|code-block|syntax|javascript|3007001|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Also make sure to output a Content-type header first. Flushing doesn't work for me without:

<pre><code>header( 'Content-type: text/html; charset=utf-8' );
for($i=0; $i&lt;10; ++$i) {
 echo "Loop&lt;br /&gt;\n";
 ob_flush();
 flush();
 sleep(1);
}
</code></pre>

blocks|key|1392067|text|在脚本的头中添加以下内容：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1392068|ob_start();
ob_implicit_flush();|code-block|syntax|javascript|1392069|隐式刷新将在每次输出调用后导致刷新操作，因此不再需要显式调用flush()。请注意，在脚本执行中添加隐式刷新会影响performance。您可以为脚本添加调试模式，如下所示：|1392070|ob_start();
define(DEBUG,+1);

if(DEBUG){
++++ob_implicit_flush();
}|1392071|entityMap^0|4|1|0|0|1L|B|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Add this on the header of the script:

<pre><code>ob_start();
ob_implicit_flush();
</code></pre>

Implicit flushing will result in a flush operation after every output call so that explicit calls to flush() will no longer be needed.
Please note that adding implicit flushing in the script execution affects on performance. You can add a debugging mode for your script like:

<pre><code>ob_start();
define(DEBUG, 1);

if(DEBUG){
 ob_implicit_flush();
}
</code></pre>

I have a loop that takes very long to execute, and I want the script to display something whenever the loop iteration is done.

<pre><code>echo "Hello!";

flush();

for($i = 0; $i &lt; 10; $i ++) {
 echo $i;
 //5-10 sec execution time
 flush();
}
</code></pre>

This does not display the echos until the entire script is completed. What went wrong?

Echo 'string' while every long loop iteration (flush() not working)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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社区富文本编辑器全新改版！诚邀体验～ 

我有一个执行时间非常长的循环，我想让脚本在循环迭代完成时显示一些内容。echo "Hello!";flush();for($i = 0; $i < 10; $i ++) { echo $i; //5-10 sec execution time flush();}这在整个脚本完成之前不会显示回显。哪里出了问题？

问每次长循环迭代(flush() )都不起作用时回显'string‘
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回答 7

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问每次长循环迭代(flush() )都不起作用时回显'string‘EN

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问每次长循环迭代(flush() )都不起作用时回显'string‘
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