Function to check for IPv4 address (contribution)

 
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TRUSTAbyss
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Joined: 29 Oct 2003
Posts: 3714
Location: USA, GA

PostPosted: Mon Jul 01, 2013 6:56 pm    Post subject: Function to check for IPv4 address (contribution) Reply with quote

I created a PHP function to check for an IPv4 address and wanted to share it with you all. Enjoy!

Code:
<?php
function is_ipv4($string)
{
   // The regular expression checks for any number between 0 and 255 beginning with a dot (repeated 3 times)
   // followed by another number between 0 and 255 at the end. The equivalent to an IPv4 address.
   return (bool) preg_match('/^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$/', $string);
}

// usage
if (is_ipv4('127.0.0.1'))
{
    echo 'is a valid IPv4 address';
}
?>


Respectfully,

Joshua H. (TRUSTAbyss)
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Computer Programmer & Networking Specialist

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