i redirecting several pages dev.php using php header

<?php header(location: dev.php); ?>

i want know have been redirected here.

i have tried

<?php print "you entered using link on ".$_server["http_referer"]; ?>

but dosent work $_server["http_referer"]; works if access dev.php using <a href="dev.php">go developer page</a>

so how can referring url?

try below.

<?php header(location: dev.php?referrer=$_server[php_self]); ?>

or

header('referer: '.$_server['php_self']); header(location: dev.php);

if above methods don't work, have go sessions.

Sharma