PHP blocks multiple IPs from accessing your website

This code snippet allows you to block certain IP addresses from accessing your website

if ( !file_exists('blocked_ips.txt') ) {
 $deny_ips = array(
 '127.0.0.1',
 '192.168.1.1',
 '83.76.27.9',
 '192.168.1.163'
 );
} else {
 $deny_ips = file('blocked_ips.txt');
}
// read user ip adress:
 $ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

// search current IP in $deny_ips array
if ( (array_search($ip, $deny_ips ))!== FALSE ) {
 // address is blocked:
 echo 'Your IP adress ('.$ip.') was blocked!';
 exit;
}

Multiple, PHP