How can I get PHP to display the headers it received from a browser?

Question

Are they all stored in $_SERVER? Even custom ones?

Answer 1

Try this

print_r($_SERVER)

It will list everything within the array

Answer 2

you can use getallheaders() to get an array of all HTTP headers sent.

$headers =  getallheaders(); foreach($headers as $key=>$val){   echo $key . ': ' . $val . '<br>'; }