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This article is about how PHP judges the validity of ip addresses. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

How to judge the validity of ip address by PHP

If (! strcmp (long2ip (sprintf ("% u", ip2long ($ip)), $ip)) echo "is ipn";-- regular judgment of email eregi ("^ [_ .0-9aMuzAmurz Z -]) + @ ([0-9a-zA-Z] [0-9aMuzAluzlinger -] +.) + [a-zA-Z] $", $email); an example of detecting whether ip address and mask are legal $ip = '192.168.0.84' $mask = '255.255.255.0 echo "valid ip and maskn";' 192.168.0 accountabilityIP = ip2long ($ip); $mask = ip2long ($mask); $network = ip2long ($network); if (($ip & $mask) = = $network) echo "network;? >-Thank you for reading! This is the end of the article on "how PHP judges the legitimacy of ip addresses". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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