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apcu_cas

(PECL apcu >= 4.0.0)

apcu_cas — Updates an old value with a new value

Опис

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.

Параметри

key

The key of the value being updated.

old

The old value (the value currently stored).

new

The new value to update to.

Значення, що повертаються

Повертає true у разі успіху або false в разі помилки.

Приклади

Приклад #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;
?>

Поданий вище приклад виведе щось схоже на:

$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

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