For objects, if you have SPL installed, you can hook into count() by implementing interface {@see Countable}. The interface has exactly one method, {@see Countable::count()}, which returns the return value for the count() function. Please see the {@see Array} section of the manual for a detailed explanation of how arrays are implemented and used in PHP.
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Caution: count may return 0 for a variable that isn\'t set, but it may also return 0 for a variable that has been initialized with an empty array. Use isset to test if a variable is set.
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