Getting the IP address using PHP
You can display the visitor's IP address on a webpage or you can use it for other purposes such as storing it for security (if you're running an e-commerce site), redirecting the visitor, even banning the visitor from your website if you need to.
Get IP address of a visitor
Use the REMOTE_ADDR index of the $_SERVER array to get the IP address of the visitor.
Example:
Your IP address is <?php echo $_SERVER['REMOTE_ADDR']; ?>
Output:
Your IP address is 54.81.237.159
Get IP address of a website
You can get the IP address of a website by it's URL. Include the URL as a parameter of the gethostbyname() function.
Example:
IP address of google.com is <?php echo gethostbyname('www.google.com'); ?>
Output:
IP address of google.com is 216.58.192.196