php int comparison “smaller or equal than” returns empty or null?

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php int comparison “smaller or equal than” returns empty or null?



The following expression


echo ('dfsdfds: '.(int)$item[0] . ' ' .
(int)$box[0] . ' ' .
( ( (int)$item[0] <= (int)$box[0] )?true:false) );



echoes this


dfsdfds: 70 25



I would expect the comparison expression <= to return either 1 or 0 but not null or empty...
What is wrong? what am I not thinking thorugh? I have tried to replace true with TRUE and false with FALSE, but the output didn't change...









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