ip_address.php

<?php 
	// Reference : http://www.chriswiegman.com/2014/05/getting-correct-ip-address-php/
	function get_ip() {
 
		//Just get the headers if we can or else use the SERVER global
		if ( function_exists( 'apache_request_headers' ) ) {
 
			$headers = apache_request_headers();
 
		} else {
 
			$headers = $_SERVER;
 
		}
 
		//Get the forwarded IP if it exists
		if ( array_key_exists( 'X-Forwarded-For', $headers ) && filter_var( $headers['X-Forwarded-For'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 ) ) {
 
			$the_ip = $headers['X-Forwarded-For'];
 
		} elseif ( array_key_exists( 'HTTP_X_FORWARDED_FOR', $headers ) && filter_var( $headers['HTTP_X_FORWARDED_FOR'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 )
		) {
 
			$the_ip = $headers['HTTP_X_FORWARDED_FOR'];
 
		} else {
			
			$the_ip = filter_var( $_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 );
 
		}
 
		return $the_ip;
 
	}

	echo get_ip();
?>