How can you verify if a string has a valid IP format in PHP?

To verify if a string has a valid IP format in PHP, you can use the `filter_var` function with the `FILTER_VALIDATE_IP` filter option. This function will check if the string is a valid IP address in either IPv4 or IPv6 format. 

$ip = "192.168.1.1";

if (filter_var($ip, FILTER_VALIDATE_IP)) {
    echo "Valid IP address";
} else {
    echo "Invalid IP address";
}

Keywords

PHP string IP format validation filter_var

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