基本操作

[PHP]代码

<?php  /*   *   * @class Base_Char   * @author zhangys   * @date   2012/06/25   */    class Base_Var_Char  {      public static function isUpper ( $char )      {          $ascii = ord ( $char );          if( $ascii > 64 and $ascii < 91 ) return true;          return false;      }        public static function isLower ( $char )      {          $ascii = ord ( $char );          if( $ascii > 96 and $ascii < 123 ) return true;          return false;      }        public static function toUpper ( $char )      {          if ( self::isUpper ( $char ) ) return $char;          $ascii = ord ( $char );          return chr ( $ascii - 32 );      }        public static function toLower ( $char )      {          if ( self::isLower ( $char ) ) return $char;          $ascii = ord ( $char );          return chr ( $ascii + 32 );      }  }