PHP 在页面加载时回显内容 [英] PHP echo-ing content as page loads

问题描述

所以我正在尝试使用 PHP/Apache.假设我有这个代码.

DIV 1
<?php sleep(2);?><div>DIV 2</div><?php sleep(2);?><div>DIV 3</div><?php sleep(2);?><div>DIV 4</div><?php sleep(2);?>

出于某种原因，在我的本地 apache 网络服务器上，所有数据都立即出现在浏览器中，在执行完所有 4 个 sleep() 之后(8 秒).

但是，如果我在主机的服务器上运行它，数据会实时回显到浏览器.如... div1 出现，2 秒后 div 2 出现等

这是为什么?这是 Apache 中的某些设置吗?

解决方案

不，这可能是 php 中的设置.

在您的本地服务器中，您的 php.ini 文件中启用了 output_buffering.

您可以通过设置禁用它:

output_buffering = off

要确保每次使用类似 echo 的语句时都将内容发送到浏览器，请添加:

implicit_flush = on

您还可以通过给 output_buffering 一个值来设置缓冲区大小.

output_buffering = 4096

此处的缓冲区大小为 4KB.

输出缓冲告诉 php 将所有要发送到浏览器的数据保存在内存中，直到它在您的代码中遇到 flush() 指令，缓冲区恰好已满，或者脚本结束.

这里是来自 php.net 的输出缓冲区的完整参考:php 输出缓冲区

So I'm doing some experimenting with PHP/Apache. Let's say I have this code.

<div>DIV 1</div>
<?php sleep(2); ?>
<div>DIV 2</div>
<?php sleep(2); ?>
<div>DIV 3</div>
<?php sleep(2); ?>
<div>DIV 4</div>
<?php sleep(2); ?>

For some reason on my local apache webserver all the data appears in the browser at once, after all 4 sleep()s have been executed (8 seconds).

However if I run it on my host's server, the data is echo-ed to the browser in real time. As in... div1 appears, after 2 seconds div 2 appears etc.

Why is that? Is this some setting in Apache?

解决方案

No it may be a setting in php.

In you local server, output_buffering is enabled in your php.ini file.

You can disable it by setting :

output_buffering = off

To Ensure that the content is sent to the browser each time a echo-like statement is used, add :

implicit_flush = on

You also can set the buffer size by giving output_buffering a value.

output_buffering = 4096

here the buffer size would be 4KB.

Output buffering tells php to keep in memory all data to be sent to the browser until it encouters a flush() instruction in your code, the buffer happens to be full, or it is the end of the script.

Here is the full reference for output buffer from php.net : php output buffer

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