php常用方法总结（持续更新中）

1. /**
    * 检查浏览器是否是移动端
    * @return boolean
    * true：手机浏览
    * false：pc浏览
    */
   function isMobile(){
   // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
   if (isset ($_SERVER['HTTP_X_WAP_PROFILE']))
   return true;
   //此条摘自TPM智能切换模板引擎，适合TPM开发
   if(isset ($_SERVER['HTTP_CLIENT']) &&'PhoneClient'==$_SERVER['HTTP_CLIENT'])
   return true;
   //如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
   if (isset ($_SERVER['HTTP_VIA']))
   //找不到为flase,否则为true
   return stristr($_SERVER['HTTP_VIA'], 'wap') ? true : false;
   //判断手机发送的客户端标志,兼容性有待提高
   if (isset ($_SERVER['HTTP_USER_AGENT'])) {
   $clientkeywords = array(
   'nokia','sony','ericsson','mot','samsung','htc','sgh','lg','sharp','sie-','philips','panasonic','alcatel','lenovo','iphone','ipod','blackberry','meizu','android','netfront','symbian','ucweb','windowsce','palm','operamini','operamobi','openwave','nexusone','cldc','midp','wap','mobile'
   );
   //从HTTP_USER_AGENT中查找手机浏览器的关键字
   if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {
   return true;
   }
   }
   //协议法，因为有可能不准确，放到最后判断
   if (isset ($_SERVER['HTTP_ACCEPT'])) {
   // 如果只支持wml并且不支持html那一定是移动设备
   // 如果支持wml和html但是wml在html之前则是移动设备
   if ((strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') !== false) && (strpos($_SERVER['HTTP_ACCEPT'], 'text/html') === false || (strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') < strpos($_SERVER['HTTP_ACCEPT'], 'text/html')))) {
   return true;
   }
   }
   return false;
   }
   
2. /**
   * 获取当前页面完整URL地址
    * @return string 完整URL地址
   */
   function get_url() {
   $sys_protocal = isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == '443' ? 'https://' : 'http://';
       $php_self = $_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME'];
       $path_info = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
       $relate_url = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : $php_self.(isset($_SERVER['QUERY_STRING']) ? '?'.$_SERVER['QUERY_STRING'] : $path_info);
       return $sys_protocal.(isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '').$relate_url;
   }
   
3. /**
   * 计算距现在的时间
    * @return string 时间
   */
   function computeTime($time){
   $disparity = time() - $time;
   switch($disparity){
   case $disparity>86400:
   return floor($disparity/86400).'天前';
   break;
   case $disparity>3600:
   return floor($disparity/3600).'小时前';
   break;
   case $disparity>60:
   return floor($disparity/60).'分钟前';
   break;
   default:
   return $disparity.'秒前';
   break;
   }
   }
   
4. /**
    * 生成数字验证码
    * @param number $length：长度
    * @return string $key：手机验证码
    */
   function randomkeys($length){
   $pattern='0123456789';
   for($i=0;$i<$length;$i++){
   $key .= $pattern{mt_rand(0,9)};    //生成php随机数
   }
   return $key;
   }
   
5. /**
    * 解压rar压缩包，需要服务器配置支持
    * @param $zipPath：压缩包原路径
    * @param $zipToPath：压缩包解压路径
    */
   function doRar($zipPath,$zipToPath){
   $rar_file = rar_open($zipPath) or die("Can't open Rar archive");
   $lists = rar_list($rar_file);
   foreach ($lists as $rar) {
   $rar->extract($zipToPath);
   }
   rar_close($rar_file);
   }
   
6.