Here is another blog which mentions how to verify if Xdebug is properly installed or not via the command line
http://allcodeverything.blogspot.com/2012/07/code-debugging-with-xdebug-and-eclipse.html
It mentions this
If you want to figure out if everything worked well, here is a nice piece of code that you'll run through the CLI (command-line interpreter, basically outside of Apache or a browser; just pure PHP) after you have typed the following in your browser: "http://localhost/dbgtest.php?XDEBUG_SESSION_START=ceable"
<?php
$address = "localhost";
$xdebug_port = 9000;
$sock = socket_create(AF_INET, SOCK_STREAM, 0);
socket_bind($sock, $address, $xdebug_port) or die('Unable to bind');
socket_listen($sock);
$debug_client = socket_accept($sock);
echo "connection established: $debug_client";
socket_close($debug_client);
socket_close($sock);
?>
The command-line window should print something like "connection established: Resource id #5".