(PHP 4, PHP 5, PHP 7, PHP 8)
ob_end_clean — 清空（擦除）活动缓冲区的内容并关闭它
该函数调用输出处理程序（使用 PHP_OUTPUT_HANDLER_CLEAN 和 PHP_OUTPUT_HANDLER_FINAL
flag），丢弃它的返回值，丢弃活动输出缓冲区的内容并关闭活动输出缓冲区。
如果没有以 PHP_OUTPUT_HANDLER_REMOVABLE flag 启动的活动输出缓冲区，ob_end_clean() 将失败。
ob_end_clean() 将丢弃活动输出缓冲区的内容，即使是在没有 PHP_OUTPUT_HANDLER_CLEANABLE flag 的情况下启动的。
此函数没有参数。
如果函数失败了，将生成 E_NOTICE 异常。
下面的示例展示了去除活动输出缓冲内容的简单方法：
示例 #1 ob_end_clean() 示例
<?php
ob_start();
echo 'Text that won\'t get displayed.';
ob_end_clean();
?>
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:
<?php
ob_start();
$output = ob_get_contents();
ini_set('zlib.output_compression', '1');
ob_end_clean();
?>
ob_end_clean(); in this example will throw the error.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:
<?php
$ignore_callback = false;
ob_start('my_callback');
...
if($need_to_abort) {
$ignore_callback = true;
ob_end_clean();
...
}
function my_callback(&$buffer) {
if($GLOBALS['ignore_callback']) {
return "";
}
...
}
?>