(PECL apc >= 3.1.1)
apc_dec — Decrease a stored number
$key
[, int $step = 1
[, bool &$success
]] )Decreases a stored integer value.
keyThe key of the value being decreased.
stepThe step, or value to decrease.
successOptionally pass the success or fail boolean value to this referenced variable.
Returns the current value of key's value on success,
或者在失败时返回 FALSE
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)