PHP IF Else

if() {...} else if () {...} else {...} check conditions, and then execute commands that satisfy the condition.

<?PHP
	$sum=0;
	$sum2=0;
	$sum3=0;
	for($ii=0;$ii<100;$ii++)
	{
		if ($ii % 2 == 0)
		{
			$sum2 += $ii;
		}
		else if ($ii % 3 == 0)
		{
			$sum3 += $ii;
		}
		else
		{
			$sum += $ii;
		}
	}
?>

PHP operators for comparison:

Symbol
Definition
==
equal to
===
identical to
!=
not equal to
>
greater than
>=
greater than or equal to
<
less than
<=
less than or equal to
and
whether two conditions are both satisfied
&&
whether two conditions are both satisfied, has higher operator precedence than "and"
or
whether one of the conditions is satisfied
||
whether one of the conditions is satisfied, has higher operator precedence than "or"
xor
If both conditions are satisfied, return false
!
if not satisfy the condition, return true

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