PHP Operators

PHP Arithmetic Operators :

+ - Addition      $a + $b

- - Subtraction      $a - $b

* - Multiplication    $a * $b

/ - Division              $a / $b

% - Modulus      $a % $b

PHP Assignment Operators :

x = y        x = y       The left operand gets set to the value of the expression on the right

x += y     x = x + y   Addition

x -= y      x = x - y    Subtraction

x *= y      x = x * y   Multiplication

x /= y      x = x / y    Division

x %= y    x = x % y   Modulus

Example :

<?php 

       $x=10; 

       $x += 100;

       echo $x;      // outputs 110

?>

PHP String Operators :

. Concatenation                $txt1 = "Hello"

        $txt2 = $txt1 . " world!"

                               result :       $txt2 contains "Hello world!"

.= Concatenation assignment $txt1 = "Hello"

        $txt1 .= " world!"

      result :       $txt1 contains "Hello world!"

PHP Increment / Decrement Operators :

++$x         Pre-increment Increments $x by one, then returns $x

$x++         Post-increment Returns $x, then increments $x by one

--$x         Pre-decrement Decrements $x by one, then returns $x

$x--    Post-decrement Returns $x, then decrements $x by one

Example : 

 <?php
     $x=10; 
     echo ++$x;  //outputs 11

 ?>

PHP Comparison Operators

The PHP comparison operators are used to compare two values (number or string):

Operator             Name                                    Example              Result

==                       Equal                                     $x == $y               True if $x is equal to $y

===                     Identical                               $x === $y            True if $x is equal to $y, and they are of the same type

!=                       Not equal                               $x != $y               True if $x is not equal to $y

<>                      Not equal                              $x <> $y               True if $x is not equal to $y

!==                     Not identical                        $x !== $y              True if $x is not equal to $y, or they are not of the same type

>                        Greater than                          $x > $y                  True if $x is greater than $y

<                       Less than                                $x < $y                  True if $x is less than $y

>=           Greater than or equal to                 $x >= $y               True if $x is greater than or equal to $y

<=           Less than or equal to                     $x <= $y               True if $x is less than or equal to $y

PHP Logical Operators 

Operator Name Example Result

&& And $x && $y True if both $x and $y are true
|| Or $x || $y True if either $x or $y is true
! Not !$x True if $x is not true