ob_clean和ob_flush之间的区别？

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

例：

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)

关键区别在于放弃更改并输出到浏览器。*_clean()*_flush()

ob_end_clean（）

它主要用于当您想要拥有一大块html并且不想立即输出到浏览器但将来可能会使用时。

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);

其中，ob_end_flush（） 将呈现两次，每次渲染一次。