Shulou(Shulou.com)06/03 Report--

Editor to share with you when the browser preview PHP file when the top blank affects the layout how to do, I believe that most people do not understand, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

In the process of writing the PHP file, it is found that when the browser previews the PHP file, a line of white space appears at the top, affecting the layout of the page.

The explanation for BOM header is as follows:

Usually, you use the notepad program that comes with the Windows system to write a web program, but after writing or modifying the php blog system code, there are always some problems such as the following:

-cannot log in or log out

-A blank appears at the top of the page

-error warning at the top of the page

-other abnormal conditions.

Analyze the reasons:

Due to the use of UTF-8 encoding, it is saved to utf-8 encoding format after writing or modifying the code. Although almost all text editing software can display and edit UTF-8-encoded files, it is a pity that many of them do not perform well.

Class like WINDOWS's own notepad and other software, when saving a UTF-8-encoded file, will insert three invisible characters (_ 0xEF _ 0xBB _ 0xBF, that is, BOM--Byte Order Mark) at the beginning of the file. It is a string of hidden characters used by editors such as notepad to identify whether the file is encoded in UTF-8. For general files, this will not cause any trouble. But for PHP, PHP did not consider the problem of BOM in the design, will not ignore the three characters of the BOM at the beginning of the UTF-8-encoded file, and will take BOM as part of the body at the beginning of the file. Because it has to be in

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