(PECL memcache >= 0.2.0)
Memcache::delete — Delete item from the server
$key, int $timeout = 0): bool
   Memcache::delete() deletes an item with the key. 
  
keyThe key associated with the item to delete.
timeout
       This deprecated parameter is not supported, and defaults to 0 seconds.
       Do not use this parameter.
      
   Returns true on success or false on failure.
  
| Version | Description | 
|---|---|
| Unknown | It's not recommended to use the timeoutparameter. The
       behavior differs between memcached versions, but setting to0is safe. Other values for this deprecated feature may cause the memcache delete
       to fail. | 
Example #1 Memcache::delete() example
<?php
/* procedural API */
$memcache_obj = memcache_connect('memcache_host', 11211);
/* item will be deleted by the server */
memcache_delete($memcache_obj, 'key_to_delete');
/* OO API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
$memcache_obj->delete('key_to_delete');
?>