change IP if it is coming from cloudflare

cloudflare.php

<?php
//Cloudflare IP Reset
//See if ip fits in IP range
function ip_in_network($ip, $net_addr, $net_mask){
    if($net_mask <= 0){ return false; }
        $ip_binary_string = sprintf("%032b",ip2long($ip));
        $net_binary_string = sprintf("%032b",ip2long($net_addr));
        return (substr_compare($ip_binary_string,$net_binary_string,0,$net_mask) === 0);
}
//See if the "Cloudflare IP" is really a cloudflare IP
if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
	$ishost = 0; $iscloudflare = 0;
	$cloudflare_ips = array ( //Cloudflare Owned IP Ranges
		'1' => array(
			'ip' => '103.21.244.0',
			'range' => '22'
		),
		'2' => array(
			'ip' => '103.22.200.0',
			'range' => '22'
		),
		'3' => array(
			'ip' => '103.31.4.0',
			'range' => '22'
		),
		'4' => array(
			'ip' => '104.16.0.0',
			'range' => '12'
		),
		'5' => array(
			'ip' => '108.162.192.0',
			'range' => '18'
		),
		'6' => array(
			'ip' => '141.101.64.0',
			'range' => '18'
		),
		'7' => array(
			'ip' => '162.158.0.0',
			'range' => '15'
		),
		'8' => array(
			'ip' => '172.64.0.0',
			'range' => '13'
		),
		'9' => array(
			'ip' => '173.245.48.0',
			'range' => '20'
		),
		'10' => array(
			'ip' => '188.114.96.0',
			'range' => '20'
		),
		'11' => array(
			'ip' => '190.93.240.0',
			'range' => '20'
		),
		'12' => array(
			'ip' => '197.234.240.0',
			'range' => '22'
		),
		'13' => array(
			'ip' => '198.41.128.0',
			'range' => '17'
		),
		'14' => array(
			'ip' => '199.27.128.0',
			'range' => '21'
		),
	);
	$cur_ip = 1;
	$num_ip = count($cloudflare_ips);
	while ($cur_ip < $num_ip) {
		if (ip_in_network($_SERVER['REMOTE_ADDR'],$cloudflare_ips[$cur_ip]['ip'],$cloudflare_ips[$cur_ip]['range'])) {$iscloudflare = 1;} //If IP matches any of cloudflare's
		$cur_ip = ++$cur_ip;
	}
	if ($_SERVER['REMOTE_ADDR'] == $_SERVER['SERVER_ADDR']) {$ishost = 1;} //If IP matches your servers
  	if ($iscloudflare || $ishost) {
		//If IP is really a cloudflare IP or host IP, then it's good to convert to the real user's IP
  		$_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
  	}
}