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Full Discussion: Validating IP address.
Top Forums Shell Programming and Scripting Validating IP address. Post 302217160 by fpmurphy on Tuesday 22nd of July 2008 04:47:36 AM
Old 07-22-2008
Note that this regular expression validates the format of an IPv4 address but does not work for an IPv6 address.
 

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INET_NTOP(3)								 1							      INET_NTOP(3)

inet_ntop - Converts a packed internet address to a human readable representation

SYNOPSIS
string inet_ntop (string $in_addr) DESCRIPTION
This function converts a 32bit IPv4, or 128bit IPv6 address (if PHP was built with IPv6 support enabled) into an address family appropri- ate string representation. PARAMETERS
o $in_addr - A 32bit IPv4, or 128bit IPv6 address. RETURN VALUES
Returns a string representation of the address or FALSE on failure. EXAMPLES
Example #1 inet_ntop(3) Example <?php $packed = chr(127) . chr(0) . chr(0) . chr(1); $expanded = inet_ntop($packed); /* Outputs: 127.0.0.1 */ echo $expanded; $packed = str_repeat(chr(0), 15) . chr(1); $expanded = inet_ntop($packed); /* Outputs: ::1 */ echo $expanded; ?> CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | This function is now available on Windows plat- | | | forms. | | | | +--------+---------------------------------------------------+ SEE ALSO
long2ip(3), ip2long(3), inet_pton(3). PHP Documentation Group INET_NTOP(3)
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