php常用方法總結（持續更新中）

1. /**
    * 檢查瀏覽器是否是移動端
    * @return boolean
    * true：手機瀏覽
    * false：pc瀏覽
    */
   function isMobile(){
   // 如果有HTTP_X_WAP_PROFILE則一定是移動設備
   if (isset ($_SERVER['HTTP_X_WAP_PROFILE']))
   return true;
   //此條摘自TPM智能切換模板引擎，適合TPM開發
   if(isset ($_SERVER['HTTP_CLIENT']) &&'PhoneClient'==$_SERVER['HTTP_CLIENT'])
   return true;
   //如果via信息含有wap則一定是移動設備,部分服務商會屏蔽該信息
   if (isset ($_SERVER['HTTP_VIA']))
   //找不到爲flase,否則爲true
   return stristr($_SERVER['HTTP_VIA'], 'wap') ? true : false;
   //判斷手機發送的客戶端標誌,兼容性有待提高
   if (isset ($_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'
   );
   //從HTTP_USER_AGENT中查找手機瀏覽器的關鍵字
   if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {
   return true;
   }
   }
   //協議法，因爲有可能不準確，放到最後判斷
   if (isset ($_SERVER['HTTP_ACCEPT'])) {
   // 如果只支持wml並且不支持html那一定是移動設備
   // 如果支持wml和html但是wml在html之前則是移動設備
   if ((strpos($_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. /**
   * 獲取當前頁面完整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. /**
   * 計算距現在的時間
    * @return string 時間
   */
   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).'小時前';
   break;
   case $disparity>60:
   return floor($disparity/60).'分鐘前';
   break;
   default:
   return $disparity.'秒前';
   break;
   }
   }
   
4. /**
    * 生成數字驗證碼
    * @param number $length：長度
    * @return string $key：手機驗證碼
    */
   function randomkeys($length){
   $pattern='0123456789';
   for($i=0;$i<$length;$i++){
   $key .= $pattern{mt_rand(0,9)};    //生成php隨機數
   }
   return $key;
   }
   
5. /**
    * 解壓rar壓縮包，需要服務器配置支持
    * @param $zipPath：壓縮包原路徑
    * @param $zipToPath：壓縮包解壓路徑
    */
   function doRar($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.