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How can I determine the IP address of a server in PHP?

What is an IP address?IP address or IP address - it is a numerical value assigned to each device on the network that uses the Internet Protocol to communicate. 
The IP address has two main functions:
  • Identifying the network / host interface
  • Addressing
Static IP addresses that do not change very often and are provided to servers. The ISP provides a unique IP address to the home machine that dials through the modem, and this IP address is unique for this session and may change next time for the machine.How to determine Your server IP address:$_SERVER - it is an array in PHP that contains information about the headers, paths and locations of scripts. The web server itself creates records of this array. While this does not guarantee that every web server will serve the contents of these arrays, servers can usually skip some of the contents of the $_SERVER array. 
To get the IP address of the server, you can use [’ SERVER_ADDR ’], it returns the IP address of the server that is being executed by the current script.Another method - using [’ REMOTE_ADDR ’] in $_SERVER array. [’ REMOTE_ADDR ’] is only used to get the IP address for local servers, although the output will be the same as using [’ SERVER_ADDR ’] for the local server IP. Example 1:This example identifies the server’s IP address using [’ SERVER_ADDR ’].  
// PHP program for getting IP addresses
// server 
// Create a variable to store
// server address $ip_server = $_ SERVER [ ’SERVER_ADDR’ ];  
// Print the saved address echo "Server IP Address is: $ip_server" ;  
?>
Output:
Server IP Address is:::1 
Example 2:This example identifies the server IP address using [’ REMOTE_ADDR ’].  
// PHP program to get IP address
// server 
// Create a variable to store
// Server IP address $ip = $_ SERVER [ ’REMOTE_ADDR’ ];  
// Print the saved address echo "IP Address is: $ip" , "
"
;  
?>
Output:
Server IP Address is:::1 
Note.If you try to run the above code in any online IDE, it will either throw a runtime error or will not give any output since private domains do not share their IP addresses, try running them on localhost or server. For localhost, if an ipv4 loopback address is used, it will give 127.0.0.1, and if an ipv6 loopback address is used, it will give::1.

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