Operators in PHP

PHP Operators

All the valid operators are available in PHP just like any other language. A list of operators is given below.

Operator Description Example
+ Addition if x=1, x+2 will be 3
- Sutraction if x=2, x-2 will be 0
* Multiplication if x=2, x*2 will be 2
/ Division if x=2, x/2 will be 1
++ Increment if x=1 x++ will be 2
-- Decrement if x=2, x-- will be 1
+= Set RHS + LHS to LHS if x=2, x+=3 will set the value of 5 in x. Similary
other operatos like -=, *=, /= and .= etc.
Logical Operators in PHP

Logical operators when evaluated, return a boolean value.i.e true or false. For Example, if x=2 and y=3 then the expression x>y will evaluate to be false. These operators are mostly used in looping and conditional processing. We will very soon learn these topics.

Operator Description Example
> Greater than if x=1, x>2 will return false (0)
< Less than if x=1, x<2 will return true (1)
>= Greater than or Equal to if x=1, x>=1 will return true (1)
<= Less than or Equal to if x=1, x<=2 will return true (1)
!= Not Equal to if x=1, x!=2 will return true (1)

The following example will clarify these concepts.

Example

The PHP Code Output of this code 
<?php
$x = 2;
$y = 3;
echo "$x > $y = ".($x>$y)."<br>";
echo "$x<$y\ = ".($x<$y)."<br>";
echo "$x!=$y = ".($x!=$y)."<br>";
echo "$x>=$y = "($x>=$y)."<br>";
?>
$x>$y =
$x<$y = 1
$x!=$y = 1
$x>=$y =

Notice the output of this code. The print function echo does not print null or false values. However it prints the "true" value as 1.

Boolean Operators in PHP

Boolean operators are used to join two logical expressions. The resulting joined expression returns true or false depending on the values of the individually joined expressions and the boolean operator. This will be clarified with an example.

Operator Description More Description
&& AND Expression joined by this operator return true only if the individual expression evaluate to true. In all other conditions, it returns false.
|| OR Expression joined by OR operator returns false only if all the individual expressions also evaluate to false. In all other conditions, it returns true.
! NOT Negates an expression. True becomes false and false becomes true.
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