WordPress Limit posts by ip address

functions.php

add_action('init','wp_limit_post_by_ip');
function wp_limit_post_by_ip(){
		global $post;
		
		#posts this is required, comma seperate
		$post_ids = array(12);
		
		#array of ips comma seperate
		$allowed_ips = array('127.0.0.1');
		if ( ! empty( $_SERVER['HTTP_CLIENT_IP'] ) ) {
		
		$ip = $_SERVER['HTTP_CLIENT_IP'];
		} elseif ( ! empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
		
		$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
		} else {
		$ip = $_SERVER['REMOTE_ADDR'];
		}
		
		if(in_array($post->ID,$post_ids)){
			
			if(!in_array($ip,$allowed_ips)){
			
			wp_redirect(home_url( ));
			exit;	
			}
		
		}
	
	
}