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Expressions

The following operators are available:

Operator	Meaning	Sample Statement	Result (int, string, bool)
=	assignment	$x = 7;	$x = 7
.	string concatenation	$x = 7 . 3;	$x = 73
+	integer addition	$x = 7 + 3;	$x = 10
-	integer subtraction	$x = 7 - 3;	$x = 4
*	integer multiplication	$x = 7 * 3;	$x = 21
/	integer division	$x = 7 / 3;	$x = 2
%	integer remainder	$x = 7 % 3;	$x = 1
==	equality	$x = 7; $x == 3;	false
!=	unequality	$x = 7; $x != 3;	true
<, <=, >, >=	string comparison	10 > 2	false
<, <=, >, >=	integer comparison	10+0 > 2+0	true
and	comparison multiplier	$x=3; $y=2; $x>=$y and $y<7	true
or	comparison multiplier	$x=3; $y=2; $x>=$y or $y>7	true
? :	conditional expression	$x==1 ? true : false;	if $x equals 1 true, otherwise false

Parentheses can be used to alter the evaluation order. By default, addition and subtraction have higher precedence than multiplication, division and remainder operations.

When needed, a variable is automatically converted from a string to an integer, or vice versa.

    $x = 1 + "2";                       $x = 3  
    $y = "The value of x is " . x;      $y = "The value of x is 3"

When comparing variables the type of comparison, string or integer, is based on the type of variable on the left side of the comparison.