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 dba_popen    (PHP 3 >= 3.0.8, PHP 4, PHP 5) dba_popen -- Open database persistently说明resource dba_popen  ( string path, string mode [, string handler [, mixed ...]] ) 
   dba_popen() establishes a persistent database instance
   for path with mode using
   handler.
  参数
    path
       Commonly a regular path in your filesystem.
     mode
       It is r for read access, w for
       read/write access to an already existing database, c
       for read/write access and database creation if it doesn't currently exist,
       and n for create, truncate and read/write access.
      handler
       The name of the handler which
       shall be used for accessing path. It is passed 
       all optional parameters given to dba_popen() and 
       can act on behalf of them.
      
返回值
   Returns a positive handle on success, or FALSE on failure.
  
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