How to use php ip2long function

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(&#39;www.example.com&#39;);
$out = "The following URLs are equivalent:<br />\n";
$out .= &#39;http://www.example.com/, http://&#39; . $ip . &#39;/, and http://&#39; . sprintf("%u", ip2long($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(&#39;www.example.com&#39;);
$long = ip2long($ip);
if ($long == -1 || $long === FALSE) {
    echo &#39;Invalid IP, please try again&#39;;
} 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 <= 5.0.2. After the fix, PHP 5.0.3 will return - 1 (Same as PHP4).

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