PHP Manual
APCu 函数
Updates an old value with a new value

apcu_cas

(PECL apcu >= 4.0.0)

apcu_cas — Updates an old value with a new value

说明

apcu_cas ( string $key , int $old , int $new ) : bool

apcu_cas() updates an already existing integer value if the old parameter matches the currently stored value with the value of the new parameter.

参数

key: The key of the value being updated.
old: The old value (the value currently stored).
new: The new value to update to.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE。

范例

Example #1 apcu_cas() example

 <?php
apcu_store('foobar', 2);
echo '$foobar = 2', PHP_EOL;
echo '$foobar == 1 ? 2 : 1 = ', (apcu_cas('foobar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;
echo '$foobar == 2 ? 1 : 2 = ', (apcu_cas('foobar', 2, 1) ? 'ok' : 'fail'), PHP_EOL;

echo '$foobar = ', apcu_fetch('foobar'), PHP_EOL;

echo '$f__bar == 1 ? 2 : 1 = ', (apcu_cas('f__bar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;

apcu_store('perfection', 'xyz');
echo '$perfection == 2 ? 1 : 2 = ', (apcu_cas('perfection', 2, 1) ? 'ok' : 'epic fail'), PHP_EOL;

echo '$foobar = ', apcu_fetch('foobar'), PHP_EOL;
?>

以上例程的输出类似于：

$foobar = 2
$foobar == 1 ? 2 : 1 = fail
$foobar == 2 ? 1 : 2 = ok
$foobar = 1
$f__bar == 1 ? 2 : 1 = fail
$perfection == 2 ? 1 : 2 = epic fail
$foobar = 1

参见

apcu_dec() - Decrease a stored number
apcu_store() - Cache a variable in the data store

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