IP 地址未验证
IP Address is not validating
我不知道为什么这段代码不起作用：
<?php
$ip = "127.0.0.1";
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) === false) {
echo("$ip is a valid IP address");
} else {
echo("$ip is not a valid IP address");
}
?>
你的问题是标志：FILTER_FLAG_NO_RES_RANGE 如果你阅读 manual 你会看到 127.0.0.1 是保留的，因为它在保留范围内：
FILTER_FLAG_NO_RES_RANGE Fails validation for the following reserved IPv4 ranges: 0.0.0.0/8, 169.254.0.0/16, 192.0.2.0/24 and 224.0.0.0/4. This flag does not apply to IPv6 addresses.
我不知道为什么这段代码不起作用：
<?php
$ip = "127.0.0.1";
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_IPV6 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) === false) {
echo("$ip is a valid IP address");
} else {
echo("$ip is not a valid IP address");
}
?>
你的问题是标志：FILTER_FLAG_NO_RES_RANGE 如果你阅读 manual 你会看到 127.0.0.1 是保留的，因为它在保留范围内：
FILTER_FLAG_NO_RES_RANGE Fails validation for the following reserved IPv4 ranges: 0.0.0.0/8, 169.254.0.0/16, 192.0.2.0/24 and 224.0.0.0/4. This flag does not apply to IPv6 addresses.