ob_get_clean()

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

得到当前缓冲区的内容并删除当前输出缓。

说明

得到当前缓冲区的内容并删除当前输出缓冲区。

ob_get_clean()实质上是一起执行了ob_get_contents()和ob_end_clean()。

返回值

返回输出缓冲区的内容，并结束输出缓冲区。如果输出缓冲区不是活跃的，即返回FALSE。

范例

A simpleob_get_clean()example

以上例程会输出：

string(11) "hello world"

参见

• ob_get_contents() 返回输出缓冲区的内容
• ob_start() 打开输出控制缓冲

The definition should mention that the function also "turns off output buffering", not just cleans it.

Also, don't forget that you will need to ob_start() again for any successive calls:

Output: 12
Without the second ob_start(), the output is 21 ...

Keep in mind that output may be buffered by default, depending on how you are running PHP (CGI, CLI, etc.).  You can use ob_get_level() to determine if an output buffer has already been started. On most web servers I've used, output buffering is already one level deep before my scripts start running.
You should only end as many output buffers as you start. Assuming that your buffer is always the first buffer, or otherwise closing pre-existing buffers, could lead to problems. In PHP 5.5, you can ensure that output buffers are ended properly using a try-finally block.
Something like this is almost guaranteed to break stuff: 

This script outputs 21 in CLI mode and 12 otherwise (under my apache and nginx)

I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate. If you are using error_log(), use ob_get_contents() and ob_end_clean() instead of ob_get_clean().

Notice that the function beneath does not catch errors, so throw in an @ before those ob_* calls

鹏仔微信 15129739599 鹏仔QQ344225443 鹏仔前端 pjxi.com 共享博客 sharedbk.com