ob_end_clean()

(PHP 4, PHP 5, PHP 7)

清空（擦除）缓冲区并关闭输出缓冲

说明

此函数丢弃最顶层输出缓冲区的内容并关闭这个缓冲区。如果想要进一步处理缓冲区的内容，必须在ob_end_clean()之前调用ob_get_contents()，因为当调用ob_end_clean()时缓冲区内容将被丢弃。

返回值

成功时返回TRUE，或者在失败时返回FALSE。错误的原因首先是，在调用时没有一个起作用的缓冲区，或者是因为某些原因缓冲区不能被删除（可能对特殊缓冲区而言）。

错误／异常

如果函数失败了，将引发一个E_NOTICE异常。

更新日志

范例

下面的例子给出了一种去除所有输出缓冲区的方法：

Example #1ob_end_clean()example

参见

• ob_start()打开输出控制缓冲
• ob_get_contents()返回输出缓冲区的内容
• ob_flush()冲刷出（送出）输出缓冲区中的内容

Note that if you started called ob_start with a callback, that callback will still be called even if you discard the OB with ob_end_clean.
Because there is no way of removing the callback from the OB once you've set it, the only way to stop the callback function from having any effect is to do something like:

Take note that if you change zlib output compression setting in between ob_start and ob_end_clean or ob_end_flush, you will get an error: ob_end_flush() failed to delete buffer zlib output compression
Example:

ob_end_clean(); in this example will throw the error.

Notice that ob_end_clean() does discard headers.
If you would like to clear the output buffer, but not the headers (because you use firephp for example...), than this is the solution:

I use it in a general exception handler in a web application, where I clear the buffer (but not the debug-info-containing headers), and send a 500 error page with readfile().
Good PHPing,
Tamas.

About the previous comment:
You can also relay on ETag and simply use time()