Get header(s) about to be sent.
Note:
This may not work as expected with the following SAPI(s): Apache2 w/PHP < 5.1.3.
Parameters
- name
specifies the name of the header to read;
if empty or omitted, an associative array with all headers will be returned
Return Values
Returns either a string containing the value of the header matching name,
FALSE
on failure, or an associative array with all headers.