memcache_debug Turn debug output on/off &reftitle.description; boolmemcache_debug boolon_off memcache_debug turns on debug output if parameter on_off is equal to &true; and turns off if it's &false;. memcache_debug is accessible only if PHP was built with --enable-debug option and always returns &true; in this case. Otherwise, this function has no effect and always returns &false;. &reftitle.parameters; on_off Turns debug output on if equals to &true;. Turns debug output off if equals to &false;. &reftitle.returnvalues; Returns &true; if PHP was built with --enable-debug option, otherwise returns &false;.