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Possible Duplicate:
Null vs. False vs. 0
How does php cast boolean variables?
I know that some values will return true for $value == NULL and not for $value === NULL but is there a complete list of these values?
Also, is isset($value) equivalent to $value === NULL and empty($value) equivalent to $value == NULL?
http://www.php.net/manual/en/types.comparisons.php