php - ob_clean 和 ob_flush 之间的区别？

Question

ob_clean() 和 ob_flush() 有什么区别？

此外，ob_end_clean() 和 ob_end_flush() 之间有什么区别？我知道 ob_get_clean() 和 ob_get_flush() 都获取内容并结束输出缓冲。

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)。

示例:

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)