This article mainly introduces the definition and usage of PHP header. Interested friends can refer to it. I hope it will be helpful to everyone.
The header() function sends raw HTTP headers to the client.
It is important to realize that the header() function must be called before any actual output is sent (in PHP 4 and above, you can use output caching to solve this problem):
Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.
Related recommendations:
php page reading and regular matching methods
php page Methods of crawling and analysis
Principle and usage of php reverse Polish algorithm
The above is the detailed content of The definition and usage of PHP header. For more information, please follow other related articles on the PHP Chinese website!