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apcu_cas

(PECL apcu >= 4.0.0)

apcu_casUpdates an old value with a new value

Descrição

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.

Parâmetros

key

The key of the value being updated.

old

The old value (the value currently stored).

new

The new value to update to.

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Exemplos

Exemplo #1 apcu_cas() example

<?php
apcu_store
('foobar'2);
echo 
'$foobar = 2'PHP_EOL;
echo 
'$foobar == 1 ? 2 : 1 = ', (apcu_cas('foobar'12) ? 'ok' 'fail'), PHP_EOL;
echo 
'$foobar == 2 ? 1 : 2 = ', (apcu_cas('foobar'21) ? 'ok' 'fail'), PHP_EOL;

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

echo 
'$f__bar == 1 ? 2 : 1 = ', (apcu_cas('f__bar'12) ? 'ok' 'fail'), PHP_EOL;

apcu_store('perfection''xyz');
echo 
'$perfection == 2 ? 1 : 2 = ', (apcu_cas('perfection'21) ? 'ok' 'epic fail'), PHP_EOL;

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

O exemplo acima irá imprimir algo similar à:

$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

Veja Também

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User Contributed Notes 1 note

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-2
Anonymous
1 year 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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