how to display array elements php

For example; in PHP the au开发者_运维问答to-global $_SERVER. How do I display the elements or keys that it has?

I am unable to find out how online.

$keys = array_keys($somearray);

Is that what you're looking for? Or are you just looking for $somearray['somekey']?

For debugging I assume?

There are a couple ways, but I always do something like this:

die(print_r($_SERVER));

Look into var_dump() and print_r. Both options should provide what you're looking for without having additional clarification for your request.