# wincache_ucache_dec

(PECL wincache >= 1.1.0)

wincache_ucache_dec — Decrements the value associated with the key

### 说明

wincache_ucache_dec(string `$key`, int `$dec_by` = 1, bool `&$success` = ?): mixed

Decrements the value associated with the `key` by 1 or as specified by `dec_by`.

### 参数

`key`

  The `key` that was used to store the variable in the cache. `key` is case sensitive.

`dec_by`

  The value by which the variable associated with the `key` will get decremented. If the argument is a floating point number it will be truncated to nearest integer. The variable associated with the `key` should be of type `long`, otherwise the function fails and returns `false`.

`success`

  Will be set to `true` on success and `false` on failure.

### 返回值

Returns the decremented value on success and `false` on failure.

### 示例

示例 #1 Using wincache_ucache_dec()

`<?php
wincache_ucache_set('counter', 1);
var_dump(wincache_ucache_dec('counter', 2923, $success));
var_dump($success);
?>`

以上示例会输出：

    int(2922)
    bool(true)

### 参见

- wincache_ucache_inc() - Increments the value associated with the key
- wincache_ucache_cas() - Compares the variable with old value and assigns new value to it

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