php 如何检查用户输入的 IP 地址是否有效？
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How do I check if a users input is a valid IP address or not?
提问by Sanjay dev
I want to check if an entered input is a valid IP address or not. I would like a specific function that will help me validate a users input.
我想检查输入的输入是否是有效的 IP 地址。我想要一个特定的功能来帮助我验证用户输入。
回答by deceze
回答by chiborg
// Usually you'd get the value from $_POST or $_GET
$ip = "10.3.1.5";
if(!filter_var($ip, FILTER_VALIDATE_IP)) {
echo "Not a valid IP address!";
}
You can modify this by filtering for IPv4 and IPv6 IP addresses and exclude private and reserved IPs.
您可以通过过滤 IPv4 和 IPv6 IP 地址并排除私有和保留 IP 来修改此设置。
回答by Aniket Singh
By using preg_match();
通过使用 preg_match();
function checkIPAddress($ipAddress)
{
return preg_match('/^(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:[.](?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3}$/', $ipAddress);
}
