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FILTER_VALIDATE_IP constant in PHP
The FILTER_VALIDATE_IP constant validates an IP address.
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
Return
The FILTER_VALIDATE_IP constant does not return anything.
Example
<?php
$ip = "35.2.1";
if (filter_var($ip, FILTER_VALIDATE_IP)) {
echo("Valid IP address!");
} else {
echo("Invalid IP address!");
}
?>
The following is the output.
Invalid IP address!
Let us see another example.
<?php
$ip = "127.0.0.1";
if (filter_var($ip, FILTER_VALIDATE_IP)) {
echo("Valid IP address!");
} else {
echo("Invalid IP address!");
}
?>
Here is the output.
Valid IP address!
Updated on: 30-Jul-2019
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