PHP 判断 IP 段方法

封装了一个函数，用来判断某个 IP 是否在指定的 IP 段。例如：

$range 支持 3 种写法：

Wildcard

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$ip = ‘192.168.1.203’; $range = ‘192.168.*.*’; ipInRange($ip, $range); // true

CIRD

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$ip = ‘192.168.1.203’; $range = ‘192.168.1/24’; ipInRange($ip, $range); // true

开始-结束

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$ip = ‘192.168.1.203’; $range = ‘192.168.1.1-192.168.1.255’; ipInRange($ip, $range); // true

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以下是封装好的函数：

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/** * $range 支持多种写法 * – Wildcard： 1.2.3.* * – CIRD：1.2.3/24 或者 1.2.3.4/255.255.255.0 * – Start-End: 1.2.3.0-1.2.3.255 * @param $ip * @param $range * @return bool */ public function ipInRange($ip, $range) { if (strpos($range, ‘/’) !== false) { // $range is in IP/NETMASK format list($range, $netmask) = explode(‘/’, $range, 2); if (strpos($netmask, ‘.’) !== false) { // $netmask is a 255.255.0.0 format $netmask = str_replace(‘*’, ‘0’, $netmask); $netmask_dec = ip2long($netmask); return ((ip2long($ip) & $netmask_dec) == (ip2long($range) & $netmask_dec)); } else { // $netmask is a CIDR size block // fix the range argument $x = explode(‘.’, $range); while (count($x) < 4) { $x[] = ‘0’; } list($a, $b, $c, $d) = $x; $range = sprintf(“%u.%u.%u.%u”, empty($a) ? ‘0’ : $a, empty($b) ? ‘0’ : $b, empty($c) ? ‘0’ : $c, empty($d) ? ‘0’ : $d); $range_dec = ip2long($range); $ip_dec = ip2long($ip); # Strategy 1 – Create the netmask with ‘netmask’ 1s and then fill it to 32 with 0s #$netmask_dec = bindec(str_pad(”, $netmask, ‘1’) . str_pad(”, 32-$netmask, ‘0’)); # Strategy 2 – Use math to create it $wildcard_dec = pow(2, (32 – $netmask)) – 1; $netmask_dec = ~$wildcard_dec; return (($ip_dec & $netmask_dec) == ($range_dec & $netmask_dec)); } } else { // range might be 255.255.*.* or 1.2.3.0-1.2.3.255 if (strpos($range, ‘*’) !== false) { // a.b.*.* format // Just convert to A-B format by setting * to 0 for A and 255 for B $lower = str_replace(‘*’, ‘0’, $range); $upper = str_replace(‘*’, ‘255’, $range); $range = “$lower-$upper”; } if (strpos($range, ‘-‘) !== false) { // A-B format list($lower, $upper) = explode(‘-‘, $range, 2); $lower_dec = (float)sprintf(“%u”, ip2long($lower)); $upper_dec = (float)sprintf(“%u”, ip2long($upper)); $ip_dec = (float)sprintf(“%u”, ip2long($ip)); return (($ip_dec >= $lower_dec) && ($ip_dec <= $upper_dec)); } return false; } }