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+===========================
+Determine if a keys exists.
+===========================
+
+.. index:: object: memcached_st
+
+--------
+SYNOPSIS
+--------
+
+
+#include <libmemcached/memcached.h>
+ 
+.. c:function::  memcached_return_t memcached_exist(memcached_st *ptr, char *key, size_t *key_length)
+
+.. c:function::  memcached_return_t memcached_exist_by_key(memcached_st *ptr, char *group_key, size_t *group_key_length, char *key, size_t *key_length)
+
+   .. versionadded:: 0.53
+
+Compile and link with -lmemcached
+
+
+-----------
+DESCRIPTION
+-----------
+
+:c:func:`memcached_exist()` can be used to check to see if a key exists. No value is returned if the key exists, or does not exist, on the server. 
+
+
+------
+RETURN
+------
+
+:c:func:`memcached_exist()` sets error to 
+to :c:type:`MEMCACHED_SUCCESS` upon finding that the key exists.
+:c:type:`MEMCACHED_NOTFOUND` will be return if the key is not found.
+
+
+----
+HOME
+----
+
+To find out more information please check:
+`http://libmemcached.org/ <http://libmemcached.org/>`_
+
+
+--------
+SEE ALSO
+--------
+
+:manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`
+
+