Call a function before outputting headers in PHP?

Question

Is there any way to have PHP automatically call a function, before a script outputs any HTTP headers?

I'm looking for something like register-shutdown-function , but to register a function that's called before the output is already sent, not after. I want my function to send a header, so I need something that's called earlier.

Answer 1

You could also trap everything with ob_start and then register a callback function to be used when you send the page with ob_end_flush . Check out the PHP manual for OB_START

Answer 2

I don't know if it is what you are looking for but you might want to investigate using auto_prepend_file in your php.ini or setting it in an .htaccess file. If you set an auto_prepend_file it will automatically include that file before running each script.

auto_prepend_file

Answer 3

查看http://www.webmasterworld.com/forum88/1225.htm您将使用PHP的header（）函数发送标题（必须在任何其他输出之前调用），但在使用之前/期间使用您的函数呼叫。