php判断IP地址,php ip验证

# 技术杂谈 2019-07-31 17:00 0 1,830 来源：海墨

正则表达式来判断是否是合法的IP

if ( preg_match( '#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', $ip ) ) {
	echo "it's valid";
}else{
	echo "it's not valid";
}

php自带函数来判断是否是合法的IP

// 判断是否是合法IP
if(filter_var($ip, FILTER_VALIDATE_IP)) {
	echo "it's valid";
}else {
	echo "it's not valid";
}
  
// 判断是否是合法的IPv4 IP地址
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
	echo "it's valid";
}else {
	echo "it's not valid";
}
// 判断是否是合法的公共IPv4地址，192.168.1.1这类的私有IP地址将会排除在外
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE)) {
	echo "it's valid";
}else {
	echo "it's not valid";
}
// 判断是否是合法的IPv6地址
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE)) {
	echo "it's valid";
}else {
	echo "it's not valid";
}
// 判断是否是public IPv4 IP或者是合法的Public IPv6 IP地址
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
	echo "it's valid";
}else {
	echo "it's not valid";
}