apcu_dec

(PECL apcu >= 4.0.0)

apcu_dec — Decrease a stored number

说明

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

Decreases a stored integer value.

参数

key: The key of the value being decreased.
step: The step, or value to decrease.
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 decrementing 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

范例

Example #1 apcu_dec() example


<?php
echo "Let's do something with success", PHP_EOL;

apcu_store('anumber', 42);

echo apcu_fetch('anumber'), PHP_EOL;

echo apcu_dec('anumber'), PHP_EOL;
echo apcu_dec('anumber', 10), PHP_EOL;
echo apcu_dec('anumber', 10, $success), PHP_EOL;

var_dump($success);

echo "Now, let's fail", PHP_EOL, PHP_EOL;

apcu_store('astring', 'foo');

$ret = apcu_dec('astring', 1, $fail);

var_dump($ret);
var_dump($fail);
?>

以上例程的输出类似于：

Let's do something with success
42
41
31
21
bool(true)
Now, let's fail

bool(false)
bool(false)

参见

apcu_inc() - Increase a stored number

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