note 98048 added to function.max

max() on undefined parameters does not assume the value is zero, it ignores it.
<?php
$dimensions = array('left' => -2);
// If $dimensions['right'] was never set, 
// we may expect it to be treated as zero, but
print max($dimensions['left'], $dimensions['right']);
//
// Returns -2, not zero

<?php
print max(0+$dimensions['left'], 0+$dimensions['right']);
?>
would be a work-around, but it's probably tidier to ensure your values are set correctly first.

(on PHP 5.2.11 anyway)
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