PHP 5.6.0RC3 is available

apc_cas

(PECL apc >= 3.1.1)

apc_casUpdates an old value with a new value

Descrizione

bool apc_cas ( string $key , int $old , int $new )

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

Elenco dei parametri

key

The key of the value being updated.

old

The old value (the value currently stored).

new

The new value to update to.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Esempi

Example #1 apc_cas() example

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

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

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

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

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

Il precedente esempio visualizzerĂ  qualcosa simile a:

$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

Vedere anche:

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User Contributed Notes 1 note

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7
Piet Delport
3 years ago
In case anyone is puzzled by the function name, "cas" refers to http://en.wikipedia.org/wiki/Compare-and-swap
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