如果语句大于或等于0但不为空

Question

How can I do an if statement for greater than or equal to 0 but not empty? AND less than X?

At the moment if $score is empty then it considers it zero.

<?php if ($score >= 0 AND $score < $passmark) { ?>

Answer 1

Add a special case for zero:

if ($score === 0 || ($score > 0 && $score < $passmark))

$score === 0 will fail for false, 0.0, "", "0", [], null; and these values will fail $score > 0 check. If you want to extend your definition of empty to include any of these values add a special case just as you did for 0.