Memcache::decrement
(no version information, might be only in CVS)
Memcache::decrement -- Decrement item's value
说明
int
Memcache::decrement ( string key [, int value] )
Memcache::decrement() decrements value of the
item by value. Similarly to
Memcache::increment(), current value of the item is
being converted to numerical and after that value
is substracted.
注意:
New item's value will not be less than zero.
注意:
Do not use Memcache::decrement() with item, which was
stored compressed, because consequent call to
Memcache::get() will fail.
create an item if it didn't exist.
Also you can use
memcache_decrement() function.
参数
key
Key of the item do decrement.
value
Decrement the item by value. Optional and defaults to 1.
返回值
Returns item's new value on success or FALSE on failure.
范例
例 1. Memcache::decrement() example
<?php
/* procedural API */
$memcache_obj = memcache_connect('memcache_host', 11211);
/* decrement item by 2 */
$new_value = memcache_decrement($memcache_obj, 'test_item', 2);
/* OO API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
/* decrement item by 3 */
$new_value = $memcache_obj->decrement('test_item', 3);
?>
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参见
| Memcache::increment() |
| Memcache::replace() |