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<?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;
}