(PHP 4, PHP 5, PHP 7)
dba_popen — Open database persistently
   dba_popen() establishes a persistent database instance
   for path with mode using
   handler.
  
pathCommonly a regular path in your filesystem.
modeIt 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.
      
   Returns a positive handle on success or FALSE on failure.