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.
apc_dec
(PECL apc >= 3.1.1)
apc_dec — Decrease a stored number
说明
apc_dec
( string
$key
[, int $step = 1
[, bool &$success
]] ) : intDecreases 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
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