IP地址子网掩码计算，返回IP段起止范围、长度、掩码等信息。
- /**
- * 掩码计算器
- * @author WeakSun
- * @param string $ip IP
- * @param numeric $bits 掩码
- * @return array 返回结果集
- */
- function netmask($ip, $bits = 24) {
- $result = [
- 'start' => 0, //第一个IP
- 'end' => 0, //最后一个IP
- 'length' => 0, //包含的IP个数
- 'netmask' => (~pow(2, 32 - $bits)) + 1, //子网掩码
- 'networkSegment' => 0, //IP段
- 'bcast' => 0//广播地址
- ];
- $result['length'] = abs($result['netmask']) - 2;
- $result['networkSegment'] = ip2long($ip) & $result['netmask'];
- $result['start'] = $result['networkSegment'] + 1;
- $result['end'] = $result['networkSegment'] + $result['length'];
- $result['bcast'] = $result['end'] + 1;
- return $result;
- }
- list($ip, $bits) = explode('/', '192.168.1.5/25');
- $tmpArr = netmask($ip, $bits);
- foreach ($tmpArr as $k => &$v) {
- $k != 'length' && $v = long2ip($v);
- }
- echo '
' . var_export($tmpArr, true).' 登录后复制
- 'start' => '192.168.1.1',
- 'end' => '192.168.1.126',
- 'length' => 126,
- 'netmask' => '255.255.255.128',
- 'networkSegment' => '192.168.1.0',
- 'bcast' => '192.168.1.127',
- )
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子网掩码
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