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PHP Methods dealing with CAS

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Wed, 05/23/2012 - 15:44
phpboi
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Joined: 05/23/2012
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I'm at a loss for how to use a CAS token with PHP methods.
I think my main hangup is how to get the CAS token to begin with.

I consulted the manual: http://www.couchbase.com/docs/couchbase-sdk-php-1.0/api-reference-summar...
I googled around quite a bit and poked through these forums and can't find the answer.

I'm using version 1.0.3 of the couchbase PHP extension.

I've tried using the method getDelayed: http://www.couchbase.com/docs/couchbase-sdk-php-1.0/api-reference-retrie...

This method does not seem to return anything useful.

Can anybody provide some sample method calls for setting/getting values involving a CAS token in PHP?

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Wed, 06/13/2012 - 19:38
BigBlueHat
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Joined: 01/28/2011
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Hey phpboi,

First, sorry for the slow reply. Hopefully this answer will get you back on the right track.

Second, it looks like you've found a bug with our documentation which I've reported [1].

getDelayed() actually returns a Boolean and is meant to be used with a callback function. If you're using PHP 5.3+, this code should work for retrieving the $cas value:

$cas = 0;
$cb->getDelayed(array('key_name'), true, function($cb, $data) use (&$cas) { $cas = $data['cas']; }));
print_r($cas); // outputs the returned cas value

Additionally, the $data array in that callback contains the key and value for the item you're getting. So it looks something like this if you print_r() it:

Array
(
    [key] => key_name
    [value] => aw yeah!
    [cas] => 6413970294305718272
)

From there you can use the cas value with cas() to conditionally update the item if the cas value matches.

Hope that helps!

[1] http://www.couchbase.com/issues/browse/PCBC-72

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