(PECL apcu >= 4.0.0)
apcu_inc — Increase a stored number
$key
[, int $step = 1
[, bool &$success
]] )Increases a stored number.
keyThe key of the value being increased.
stepThe step, or value to increase.
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 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);
?>
以上例程的输出类似于：
Let's do something with success 42 43 53 63 bool(true) Now, let's fail bool(false) bool(false)