ob_clean和ob_flush之间的区别？

Question

ob_clean()和ob_flush()有什么区别？

还有什么区别ob_end_clean()和ob_end_flush()？我知道ob_get_clean()和ob_get_flush()都获得内容和结束输出缓冲。

Answer 1

*_clean变体只是清空缓冲区，而*_flush函数打印缓冲区中的内容（将内容发送到输出缓冲区）。

Example:

ob_start();
print "foo";      // This never prints because ob_end_clean just empties
ob_end_clean();   //    the buffer and never prints or returns anything.

ob_start();
print "bar";      // This IS printed, but just not right here.
ob_end_flush();   // It's printed here, because ob_end_flush "prints" what's in
                  // the buffer, rather than returning it
                  //     (unlike the ob_get_* functions)

Answer 2

关键的区别是*_clean()丢弃更改和*_flush()输出到浏览器。

使用ob_end_clean()

它主要用于你想拥有一大块html并且不想立即输出到浏览器但可能在将来使用的时候。

例如。

ob_start()
echo "<some html chunk>";
$htmlIntermediateData = ob_get_contents();
ob_end_clean();

{{some more business logic}}

ob_start();
echo "<some html chunk>";
$someMoreCode = ob_get_content();
ob_end_clean();

renderTogether($htmlIntermediateCode, $someMoreCode);

ob_end_flush()将呈现两次，每次一次。