Assignment
| $a = $b | Assign | |
| $a += $b | $a = $a + $b | Addition |
| $a -= $b | $a = $a - $b | Subtraction |
| $a *= $b | $a = $a * $b | Multiplication |
| $a /= $b | $a = $a / $b | Division |
| $a %= $b | $a = $a % $b | Modulus |
Increment / Decrement
| ++$a | Pre-Increment | Increments $a by one, then returns $a |
| $a++ | Post-Increment | Returns $a, then Increments $a by one |
| --$a | Pre-Decrement | Decrements $a by one, then returns $a |
| $a-- | Post-Decrement | Returns $a, then Decrements $a by one |
Arithmetic
| $a + $b | Addition | Sum of $a and $b |
| $a - $b | Subtraction | Difference of $a and $b |
| $a * $b | Multiplication | Product of $a and $b |
| $a / $b | Division | Quotient of $a and $b |
| $a % $b | Modulus | Remainder of $a divided by $b |
String
| $a . $b | Concatenate | Produce single string, with contents of $a, followed by contents of $b |
| $a .= "string" | Concatenating Assignment | Concatenate "string" with $a and reassign to $a |
Comparison
| $a == $b | Equal | TRUE if $a is equal to $b |
| $a === $b | Identical | TRUE is $a is equal to $b, and they are of the same type |
| $a != $b | Not Equal | TRUE if $a is not equal to $b |
| $a <> $b | Not Equal | TRUE if $a is not equal to $b |
| $a !== $b | Not Identical | TRUE if $a is not equal to $b, or they are not of the same type |
| $a < $b | Less Than | TRUE if $a is strictly less than $b |
| $a > $b | Greater Than | TRUE if $a is strictly greater than $b |
| $a <= $b | Less Than or Equal To | TRUE if $a is less than or equal to $b |
| $a >= $b | Less Than or Equal To | TRUE if $a is greater than or equal to $b |
Logical
| $a and $b | And | TRUE if both $a and $b are TRUE |
| $a && $b | And | TRUE if both $a and $b are TRUE |
| $a or $b | Or | TRUE if either $a or $b is TRUE |
| $a || $b | Or | TRUE if either $a or $b is TRUE |
| $a xor $b | Xor | TRUE if either $a or $b is TRUE, but not both |
| ! $a | Not | TRUE if $a is not TRUE |