Can I use if(4 <= $a <= 44) instead of if(4 <= $a && $a <= 44)?
Can I use if(4 <= $a <= 44) instead of if(4 <= $a &&
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No, you can’t do that.
if(4 <= $a <= 44)is equivalent toif((4 <= $a) <= 44). This may be equivalent toif(false <= 44)orif(true <= 44), neither of which makes sense.