Validating IP addresses is a common task in web development and network programming, ensuring the accuracy and integrity of user input. In PHP, the filter_var() function provides a convenient and reliable way to validate IP addresses. In this blog post, we will explore how to validate IP addresses using the filter_var() function in PHP.
This PHP code checks the validity of a specified IP address. The IP address is validated by the code using the filter_var function and the FILTER_VALIDATE_IP filter. The code will output a message stating that the IP address is valid and displaying the IP address in green if it is. The code will produce a message informing the user that the IP address is invalid and will highlight the IP address in red.
<?php
$ip = "127.0.0.1";
if(filter_var($ip, FILTER_VALIDATE_IP)) {
echo "The provided IP address <span style='color: green'>$ip</span> is valid.";
} else {
echo "The provided IP address <span style='color: red'>$ip</span> is not valid.";
}It should be noted that the IP address is hardcoded in this code as 127.0.0.1. Replace this number with the IP address you want to check if you want to check a different IP address. I hope that’s been informative to you. If you wish to learn more about PHP, please subscribe to our newsletter today and continue your PHP learning journey with us!
