Determine if a keys exists
SYNOPSIS
- #include <libmemcached/memcached.h>
- Compile and link with -lmemcached 
- 
memcached_return_t memcached_exist(memcached_st *ptr, char *key, size_t *key_length)
- 
memcached_return_t memcached_exist_by_key(memcached_st *ptr, char *group_key, size_t *group_key_length, char *key, size_t *key_length)
- Parameters:
- ptr -- pointer to an initialized - memcached_ststruct
- group_key -- the key namespace 
- group_key_length -- length of the - group_keywithout any terminating zero
- key -- the key to check 
- key_length -- length of the - keywithout any terminating zero
 
- Returns:
- memcached_return_tindicating success
 
Added in version 0.53.
DESCRIPTION
memcached_exist() can be used to check if a key exists.
RETURN VALUE
- MEMCACHED_SUCCESS
- The key exists. 
- MEMCACHED_NOTFOUND
- The key was not found.