(PECL memcache >= 0.2.0)

Memcache::replaceReplace value of the existing item


bool Memcache::replace ( string $key , mixed $var [, int $flag [, int $expire ]] )

Memcache::replace() should be used to replace value of existing item with key. In case if item with such key doesn't exists, Memcache::replace() returns FALSE. For the rest Memcache::replace() behaves similarly to Memcache::set(). Also you can use memcache_replace() function.



The key that will be associated with the item.


The variable to store. Strings and integers are stored as is, other types are stored serialized.


Use MEMCACHE_COMPRESSED to store the item compressed (uses zlib).


Expiration time of the item. If it's equal to zero, the item will never expire. You can also use Unix timestamp or a number of seconds starting from current time, but in the latter case the number of seconds may not exceed 2592000 (30 days).

Значення, що повертаються

Повертає TRUE в успішному випадку або FALSE в разі помилки.


Приклад #1 Memcache::replace() example



/* procedural API */
memcache_replace($memcache_obj"test_key""some variable"false30);

/* OO API */
$memcache_obj->replace("test_key""some variable"false30);


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User Contributed Notes 1 note

adam.pippin [AT]
11 years ago
This page mentions that replace should be used rather than set, but gives no reason. Best information I could find was a comment by 'argyleblanket' on the set page. (

"Using set more than once for the same key seems to have unexpected results - it does not behave as a "replace," but instead seems to "set" more than one value for the same key.  "get" may return any of the values.

This was tested on a multiple-server setup - behaviour may be different if you only have one server. "
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