[PHP] How would you code: $r = func() or return 0?

[scott [gts]]

 
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I thought i'd ask for your comments on how you'd code this
common perl code with PHP:

$value = some_function() or return 0;

i usually code my functions to return 0 or "" on error, but
have to use the following code to handle it... neither seem
like a good solution to me.

this way decreses the readability of the code:
if (!$value = some_function)
        return 0;

and this way adds an unnecessary if() statement:
$value = some_function()
if (!$value) {
        return 0;
}

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