PHP FILTER_VALIDATE_IP Filter

Example

Check if the variable $ip is a valid IP address:

<?php
$ip = "127.0.0.1";

if (filter_var($ip, FILTER_VALIDATE_IP)) {
echo("$ip is a valid IP address");
} else {
echo("$ip is not a valid IP address");
}
?>

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Definition and Usage

The FILTER_VALIDATE_IP filter validates an IP address.

Possible flags:

FILTER_FLAG_IPV4 - The value must be a valid IPv4 address
FILTER_FLAG_IPV6 - The value must be a valid IPv6 address
FILTER_FLAG_NO_PRIV_RANGE - The value must not be within a private range
FILTER_FLAG_NO_RES_RANGE - The value must not be within a reserved range

More Examples

Example 1

Check if the variable $ip is a valid IPv6 address:

<?php
$ip = "2001:0db8:85a3:08d3:1319:8a2e:0370:7334";

if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
echo("$ip is a valid IPv6 address");
} else {
echo("$ip is not a valid IPv6 address");
}
?>

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❮ PHP Filter Reference