Memcache::decrement

Decrement item's value ()
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.

Memcache::decrement() does not 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 1110. 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);
?>