How PHP determines if it is a valid IP address

Source: Internet
Author: User
When most people see this log, the first impression must be to say how to judge through regular expressions. This article mainly introduces the PHP judgment IP as a valid IP address method, the need for friends can refer to, hope to help everyone.

Not also, after php5.2.0, there is a special function to do this judgment.

Determine if it is a legitimate IP


if (Filter_var ($ip, filter_validate_ip)) {//it ' s valid}else {//It's not valid}

Determine if the IPV4 IP address is valid


if (Filter_var ($ip, Filter_validate_ip, Filter_flag_ipv4)) {//it ' s valid}else {//It's not valid}

Determine if it is a valid public IPv4 address, 192.168.1.1 This type of private IP 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 if the IPV6 address is valid


if (Filter_var ($ip, Filter_validate_ip, Filter_flag_no_res_range)) {//it ' s valid}else {//It's not valid}

Determines whether the public IPv4 IP or is a legitimate 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}

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.