如何检查是否已在PHP中设置header（）？

Question

到目前为止，PHP中是否有可能设置一些头信息？

Answer 1

Try headers_sent() .

PHP docs on headers_sent() .

You can also retrieve the headers for a page with get_headers() and list them with headers_list() . I'm a bit confused though, do you mean you want to check if something like header("Location: /path/to/location"); has been called?

Answer 2

Try using header_list() to determine what headers are ready to be sent to the client. Use headers_sent() to check if headers have been sent to the client.