# apcu_inc

(PECL apcu >= 4.0.0)

apcu_inc — Increase a stored number

### 说明

apcu_inc(
string `$key`,
int `$step` = 1,
bool `&$success` = ?,
int `$ttl` = 0
): int|false

Increases a stored number.

### 参数

`key`
  The key of the value being increased.
`step`
  The step, or value to increase.
`success`
  Optionally pass the success or fail boolean value to this referenced variable.
`ttl`
  TTL to use if the operation inserts a new value (rather than incrementing an existing one).

### 返回值

Returns the current value of `key`'s value on success, 或者在失败时返回 `false`

### 示例

示例 #1 apcu_inc() example

`<?php
echo "Let's do something with success", PHP_EOL;
apcu_store('anumber', 42);
echo apcu_fetch('anumber'), PHP_EOL;
echo apcu_inc('anumber'), PHP_EOL;
echo apcu_inc('anumber', 10), PHP_EOL;
echo apcu_inc('anumber', 10, $success), PHP_EOL;
var_dump($success);
echo "Now, let's fail", PHP_EOL, PHP_EOL;
apcu_store('astring', 'foo');
$ret = apcu_inc('astring', 1, $fail);
var_dump($ret);
var_dump($fail);
?>`

以上示例的输出类似于：

    Let's do something with success
    42
    43
    53
    63
    bool(true)
    Now, let's fail

    bool(false)
    bool(false)

### 参见

- apcu_dec() - Decrease a stored number

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open