说明：

检测一个IP地址是否在规定网段内的类。IP在指定IP段范围内的话返回TRUE和信息“IP检测通过”，IP不在IP段范围内则返回FALSE和错误信息，错误信息可以从属性“msg”中获得，详见用法和代码。

代码：

/**

* 说明：检测IP是否在IP段内

* 作者：upall

*/

class ipCheck {

public $ipRangeStr = '10.0.0.1/8';

public $msg = '';

function __construct($ipRangeStr){

!empty($ipRangeStr) ? $this->ipRangeStr = $ipRangeStr : '';

}

function check($ip = '') {

empty($ip) && $ip = $this->getClientIp();

# 判断检测类型

if (FALSE !== strpos($this->ipRangeStr,'-')){

$type = 'size'; // 简单比大小：10.0.0.1-254 OR 10.0.0.1-10.0.0.254

}else if(FALSE !== strpos($this->ipRangeStr,'/')){

$type = 'mask'; // 掩码比大小：10.0.0.1/24

}else{

$this->msg = '错误的IP范围值';

return FALSE;

}

# 分析IP范围

if ('size' === $type){

$ipRangeStr = explode('-',$this->ipRangeStr);

$ipAllowStart = $ipRangeStr[0];

$ipAllowEnd = $ipRangeStr[1];

if (FALSE === strpos($ipAllowEnd,'.')){ # 10.0.0.254 OR 254

$ipAllowElmArray = explode('.',$ipAllowStart);

$ipAllowEnd = $ipAllowElmArray[0] . '.' .

$ipAllowElmArray[1] . '.' .

$ipAllowElmArray[2] . '.' .

$ipAllowEnd;

}

}else if ('mask' === $type){

$ipRangeStr = explode('/',$this->ipRangeStr);

$ipRangeIP = $ipRangeStr[0];

# 获取掩码中最后一位非零数的值

$ipRangeMask = (int)$ipRangeStr[1];

$maskElmNumber = floor($ipRangeMask/8); # 保留IP前几段

$maskElmLastLen = $ipRangeMask % 8; # 255.255.here.0

$maskElmLast = str_repeat(1,8-$maskElmLastLen);

$maskElmLast = bindec($maskElmLast); # 掩码中IP末段最大值(十进制)

// 获取IP段开始、结束值

$ipRangeIPElmArray = explode('.',$ipRangeIP);

if (0 == $maskElmNumber){

$ipAllowStart = '0.0.0.0';

$ipAllowEnd = $maskElmLast . '.254.254.254';

}else if (1 == $maskElmNumber){

$ipAllowStart = $ipRangeIPElmArray[0] . '.' . '0.0.0';

$ipAllowEnd = $ipRangeIPElmArray[0] . '.' . $maskElmLast . '.254.254';

}else if (2 == $maskElmNumber){

$ipAllowStart = $ipRangeIPElmArray[0] . '.' . $ipRangeIPElmArray[1] . '.' . '0.0';

$ipAllowEnd = $ipRangeIPElmArray[0] . '.' . $ipRangeIPElmArray[1] . '.' . $maskElmLast . '.254';

}else if (3 == $maskElmNumber){

$ipAllowStart = $ipRangeIPElmArray[0] . '.' . $ipRangeIPElmArray[1] . '.' . $ipRangeIPElmArray[2] . '.' . '0';

$ipAllowEnd = $ipRangeIPElmArray[0] . '.' . $ipRangeIPElmArray[1] . '.' . $ipRangeIPElmArray[2] . '.' . $maskElmLast;

}else if (4 == $maskElmNumber){

$ipAllowEnd = $ipAllowStart = $ipRangeIP;

}else{

$this->msg = '错误的IP段数据';

return $this->msg;

}

}else{

$this->msg = '错误的IP段类型';

return $this->msg;

}

// 检测IP

$ipAllowStart = $this->getDecIp($ipAllowStart);

$ipAllowEnd = $this->getDecIp($ipAllowEnd);

$ip = $this->getDecIp($ip);

if (!empty($ip)){

if ($ip <= $ipAllowEnd && $ip >= $ipAllowStart){

$this->msg = 'IP检测通过';

return TRUE;

}else{

$this->msg = '此为被限制IP';

return FALSE;

}

}else{

FALSE === ($this->msg) && $this->msg == '没有提供待检测IP'; // getClentIp() 是否返回false

return $this->msg; // 没有获取到客户端IP，返回

}

}

// 10进制IP

function getDecIp($ip){

$ip = explode(".", $ip);

return $ip[0]*255*255*255+$ip[1]*255*255+$ip[2]*255+$ip[3];

}

// 获取客户端IP

function getClientIp(){

if(isset($_SERVER['REMOTE_ADDR'])){

return $_SERVER['REMOTE_ADDR'];

}else{

$this->msg = '不能获取客户端IP';

return FALSE;

}

}

}

?>

用法：

$ipCheck = new ipCheck('192.168.1.1-192.168.1.254');

echo (TRUE === $ipCheck ->check('192.168.1.45')) ? '在范围内' : $ipCheck->msg;

$ipCheck = new ipCheck('192.168.1.1-254');

echo (TRUE === $ipCheck ->check('192.168.1.45')) ? '在范围内' : $ipCheck->msg;

$ipCheck = new ipCheck('192.168.1.1/24');

echo (TRUE === $ipCheck ->check('192.168.1.45')) ? '在范围内' : $ipCheck->msg;