以后慢慢补充

/** * 函数：格式化字节大小 * @param  number $size      字节数 * @param  string $delimiter 数字和单位分隔符 * @return string            格式化后的带单位的大小 */function format_bytes($size, $delimiter = '') {    $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');    for ($i = 0; $size >= 1024 && $i < 5; $i++) $size /= 1024;    return round($size, 2) . $delimiter . $units[$i];}/** * 随机字符 * @param number $length 长度 * @param string $type 类型 * @param number $convert 转换大小写 * @return string */function random($length=6, $type='string', $convert=0){    $config = array(        'number'=>'1234567890',        'letter'=>'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',        'string'=>'abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789',        'all'=>'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'    );    if(!isset($config[$type])) $type = 'string';    $string = $config[$type];    $code = '';    $strlen = strlen($string) -1;    for($i = 0; $i < $length; $i++){        $code .= $string{
   mt_rand(0, $strlen)};    }    if(!empty($convert)){        $code = ($convert > 0)? strtoupper($code) : strtolower($code);    }    return $code;}/** * 获取客户端IP地址 * @param integer $type 返回类型 0 返回IP地址 1 返回IPV4地址数字 * @param boolean $adv 是否进行高级模式获取（有可能被伪装） * @return mixed */function get_client_ip($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];}/** * 判断是否SSL协议 * @return boolean */function is_ssl() {    if(isset($_SERVER['HTTPS']) && ('1' == $_SERVER['HTTPS'] || 'on' == strtolower($_SERVER['HTTPS']))){        return true;    }elseif(isset($_SERVER['SERVER_PORT']) && ('443' == $_SERVER['SERVER_PORT'] )) {        return true;    }    return false;}