Possible Duplicate:
php if integer between a range?
Let’s say $num = 5; How do I test if $value is anything in between +-3 of $num. In other words, how can I test if $value is equal to any of these values 2,3,4 5 6,7,8
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Two possible ways to do it:
$num - 3 <= $value && value <= $num + 3abs($num - $value) <= 3