php The ip2long function is used to convert the IPV4 string Internet protocol into a long integer number. Its usage syntax is "ip2long (string $ip_address): int", and the parameter "ip_address" represents an address in a standard format.
php ip2long function
ip2long — Converts an IPV4 string Internet protocol to a long integer number
Description
ip2long ( string $ip_address ) : int
The function ip2long() returns the long integer format of the IPV4 network address, converted from the standard network address format (dot string).
ip2long() 还可以与非完整IP进行工作。 阅读 » http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm 获得更多信息。
Parameters
ip_address
An address in a standard format.
Return value
Returns the converted number of the IP address or FALSE if ip_address is invalid.
Change log
Version
5.5.0 Prior to this version, on Windows ip2long() would sometimes return a valid number even if passed a value which was not an (IPv4) Internet Protocol dotted address.
5.2.10 Prior to this, ip2long() would sometimes return a numeric address even though this was not an IPv4 canonical address.
Example
Example #1 ip2long() Example
<?php $ip = gethostbyname('www.example.com'); $out = "The following URLs are equivalent:<br />\n"; $out .= 'http://www.example.com/, http://' . $ip . '/, and http://' . sprintf("%u", ip2long($ip)) . "/<br />\n"; echo $out; ?>
Example #2 Display IP address
The second example illustrates printing a conversion The last address uses the printf() function in PHP4 and PHP5:
<?php $ip = gethostbyname('www.example.com'); $long = ip2long($ip); if ($long == -1 || $long === FALSE) { echo 'Invalid IP, please try again'; } else { echo $ip . "\n"; // 192.0.34.166 echo $long . "\n"; // -1073732954 printf("%u\n", ip2long($ip)); // 3221234342 } ?>
Note
Note:
Because PHP's integer type is signed, and there are many IPs The address is negative in the case of 32-bit systems, and you need to use "%u" to convert the string obtained by sprintf() or printf() to represent the unsigned IP address.
Note:
ip2long() will return FALSE when the IP is 255.255.255.255 and the version is PHP 5
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