PHP常用代码片段

PHP常用代码片段

• 获取客户端IP地址

/**
 * @Author   xiadmin
 * 获取客户端IP地址
 * @param int $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
 * @param bool $adv 是否进行高级模式获取（有可能被伪装）
 * @return mixed
 */
function get_client_ip($type = 0, $adv = false) {
    $type       =  $type ? 1 : 0;
    static $ip  =   NULL;
    if ($ip !== NULL) return $ip[$type];
    if($adv){
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $arr    =   explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            $pos    =   array_search('unknown',$arr);
            if(false !== $pos) unset($arr[$pos]);
            $ip     =   trim($arr[0]);
        }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
            $ip     =   $_SERVER['HTTP_CLIENT_IP'];
        }elseif (isset($_SERVER['REMOTE_ADDR'])) {
            $ip     =   $_SERVER['REMOTE_ADDR'];
        }
    }elseif (isset($_SERVER['REMOTE_ADDR'])) {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    // IP地址合法验证
    $long = sprintf("%u",ip2long($ip));
    $ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);
    return $ip[$type];
}

• 获取服务器IP地址

/**
 * @Author xiadmin 
 * 获取服务器端IP地址
 * @return array|false|string
 */
function get_server_ip(){
    if(isset($_SERVER)){
        if($_SERVER['SERVER_ADDR']){
            $server_ip = $_SERVER['SERVER_ADDR'];
        }else{
            $server_ip = $_SERVER['LOCAL_ADDR'];
        }
    }else{
        $server_ip = getenv('SERVER_ADDR');
    }
    return $server_ip;
}

• 生成随机数

/**
 * @Author xiadmin 
 * 生成随机字符串
 * @param int $length 生成长度
 * @param int $type 生成类型：0-小写字母+数字，1-小写字母，2-大写字母，3-数字，4-小写+大写字母，5-小写+大写+数字
 * @return string
 */
function generate_rand_str($length = 8, $type = 0) {
    $a = 'abcdefghijklmnopqrstuvwxyz';
    $A = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $n = '0123456789';

    switch ($type) {
        case 1: $chars = $a; break;
        case 2: $chars = $A; break;
        case 3: $chars = $n; break;
        case 4: $chars = $a.$A; break;
        case 5: $chars = $a.$A.$n; break;
        default: $chars = $a.$n;
    }

    $str = '';
    for ($i = 0; $i < $length; $i++) {
        $str .= $chars[ mt_rand(0, strlen($chars) - 1) ];
    }
    return $str;
}

• 获取浏览器类型

/**
 * @Author xiadmin 
 * 获取浏览器类型
 * @return string
 */
function get_browser_type(){
    $agent = $_SERVER["HTTP_USER_AGENT"];
    if(strpos($agent,'MSIE') !== false || strpos($agent,'rv:11.0')) return "ie";
    if(strpos($agent,'Firefox') !== false) return "firefox";
    if(strpos($agent,'Chrome') !== false) return "chrome";
    if(strpos($agent,'Opera') !== false) return 'opera';
    if((strpos($agent,'Chrome') == false) && strpos($agent,'Safari') !== false) return 'safari';
    if(false!==strpos($_SERVER['HTTP_USER_AGENT'],'360SE')) return '360SE';
    return 'unknown';
}