(PECL memcache >= 0.2.0)
memcache_debug — Turn debug output on/off
$on_off
   )
   memcache_debug() turns on debug output if parameter
   on_off is equal to TRUE and turns off if it's
   FALSE.
   
Note:
memcache_debug() is accessible only if PHP was built with --enable-debug option and always returns
TRUEin this case. Otherwise, this function has no effect and always returnsFALSE.
on_off
       Turns debug output on if equals to TRUE.
       Turns debug output off if equals to FALSE.
      
   Returns TRUE if PHP was built with --enable-debug option, otherwise
   returns FALSE.