apcu_cas

(PECL apcu >= 4.0.0)

apcu_casUpdates an old value with a new value

Açıklama

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.

Bağımsız Değişkenler

key

The key of the value being updated.

old

The old value (the value currently stored).

new

The new value to update to.

Dönen Değerler

Başarı durumunda true, başarısızlık durumunda false döner.

Örnekler

Örnek 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;
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

$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

Ayrıca Bakınız

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User Contributed Notes 1 note

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-2
Anonymous
6 years ago
The output in the example says:

$f__bar == 1 ? 2 : 1 = fail

but in reality it should be:

$f__bar == 1 ? 2 : 1 =  ok

the first time the code is ran as the cache is empty and apcu_cas allows the key to be inserted.
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