Leaderboard

The logic $number != 101 OR $number != 102 is always true. Look at the conditions separately for various cases: Case 1) $number = 99 $number != 101 => true $number != 102 => true true || true => true Case 2) $number = 101 $number != 101 => false $number != 102 => true false || true => true Case 3) $number = 102 $number != 101 => true $number != 102 => false true || false => true What you want is AND, not OR. Case 1) $number = 99 $number != 101 => true $number != 102 => true true && true => true Case 2) $number = 101 $number != 101 => false $number != 102 => true false && true => false Case 3) $number = 102 $number != 101 => true $number != 102 => false true && false => false

Think about your logic. If $number is 101 then it <>102, right? And if $number is 102 then it <>101, right? Also, please do what the rest of the PHP community does: use the && || != operators instead of AND OR <>. The first group is what you see in programming languages. The second group is what you see in SQL. PHP is not SQL.

When mixing AND and OR in expressions, use parentheses to make the logic explicit. For example, instead of if (A AND B OR C) use one of these, depending on what you mean if ( (A AND B) OR C ) or if ( A AND ( B OR C ) )