Display all visitor request variables

[StevenOliver]

For debug purposes, I want to see all (each and every possible) variables from a website visitor, e.g.
• their user agent (e.g. cURL)
• the reqest string they used (e.g. "https://example.com/product.php?sku=12345")
• their IP address
• and everything else I haven't thought of

I know how to save the info in a database, I might even have the info emailed to myself, I just can't remember the "one-liner" I used to use to capture this info.

Thank you in advance!

 

[gw1500se]

echo "<pre>";
var_dump(getallheaders());
echo "</pre>";

 

[requinix]

And learn about $_SERVER.

[StevenOliver]

Thank you both gw1500se and Requinix! The answer from gw1500se was the one I was looking for.... but it ended up not working -- didn't display anything but a blank screen, so maybe some configuration on my server is interfering... The answer from Requinix is important, too -- however, when I tried "print_r($_SERVER)" and just got a blank screen, I gave up..... until (several hours later) it dawned on me that I had to loop through nested arrays. This works for me here:

foreach($_SERVER as $a => $b) {
echo $a;
echo "\n";
echo $b;
echo "\n";
foreach ($b as $c=>$d) {
echo "$c";
echo "\n";
echo "$d";
}
}

 

[requinix]

Instead of trying to print it yourself, use print_r() or var_dump(). They exist specifically for this purpose.

[Barand]

For increased readability, use them between <pre>..</pre> tags

E.G.

echo '<pre>' . print_r($_SERVER, true) . '</pre>';