apc_dec()
(PECL apc >= 3.1.1)
Decrease a stored number
说明
apc_dec(string $key[,int $step= 1[,bool &$success]]): int
Decreases a stored integer value.
参数
- $key
The key of the value being decreased.
- $step
The step, or value to decrease.
- $success
Optionally pass the success or fail boolean value to this referenced variable.
返回值
Returns the current value of$key's value on success,或者在失败时返回FALSE
范例
Example #1 apc_dec() example
<?php echo "Let's do something with success", PHP_EOL; apc_store('anumber', 42); echo apc_fetch('anumber'), PHP_EOL; echo apc_dec('anumber'), PHP_EOL; echo apc_dec('anumber', 10), PHP_EOL; echo apc_dec('anumber', 10, $success), PHP_EOL; var_dump($success); echo "Now, let's fail", PHP_EOL, PHP_EOL; apc_store('astring', 'foo'); $ret = apc_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
apc_inc()
递增一个储存的数字
check for errors with === FALSE or === 0 dec() will increase to 3, 2, 1, 0, -1, -2, -3.... if you check with == FALSE you will get an wrong FALSE result if the variable is on 0.