Validate ip address
Let's see how to validate an ip address.
Use the filter_Var() built-in function.
The argument uses the constant FILTER_VALIDATE_IP.
How to validate ip address using filter_var() function
filter_Var('ip',FILTER_VALIDATE_IP);
The first argument uses the ip address, the second uses the constant FILTER_VALIDATE_IP.
As shown in the example, you can change the purpose according to the value of a constant.
Returns true if the ip address is valid or false.
The following example validates ip.
<?php $ip = '192.168.0.1'; $checkIp = filter_Var($ip, FILTER_VALIDATE_IP); if($checkIp == true) { echo "correct ip"; } else { echo "The ip address is not correct."; } ?>
result
This time let's test by entering the wrong ip address.
<?php $ip = '192.168.0'; $checkIp = filter_Var($ip, FILTER_VALIDATE_IP); if($checkIp == true) { echo "correct ip"; } else { echo "The ip address is not correct."; } ?>
result