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apcu_cas

(PECL apcu >= 4.0.0)

apcu_casUpdates an old value with a new value

Description

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.

Parameters

key

The key of the value being updated.

old

The old value (the value currently stored).

new

The new value to update to.

Return Values

Returns true on success or false on failure.

Examples

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;
?>

The above example will output something similar to:

$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

See Also

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User Contributed Notes 1 note

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-7
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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