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This time I will give you a detailed explanation of the steps for PHP to determine whether an IP is a valid IP address. What are the precautions for PHP to determine whether an IP is a valid IP address? The following is a practical case, let's take a look.
No, after php5.2.0, there is a specialfunction to make this judgment.
Judge whether it is a legal IPif(filter_var($ip, FILTER_VALIDATE_IP)) {
// it's valid
}
else {
// it's not valid
}Judge whether it is a legal IPv4 IP address
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
// it's valid
}
else {
// it's not valid
}Judge whether it is a legal public IPv4 address, private IP such as 192.168.1.1 The address will be excluded
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE)) {
// it's valid
}
else {
// it's not valid
} Determine whether it is a legal IPv6 address
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE)) {
// it's valid
}
else {
// it's not valid
} Determine whether it is a public IPv4 IP or a legal Public IPv6 IP address
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
// it's valid
}
else {
// it's not valid
} I believe I read it You have mastered the method in the case of this article. For more exciting information, please pay attention to other related articles on the php Chinese website! Recommended reading:
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