PHP Operators

All programming languages use some operators to manipulate operations on variables and values such as assign, multiply, add, subtract and concatenate them, the operators may be between a variable and a value, or between two values, or between two variables.
Operators have the form of symbols (such as + and -) and combinations of symbols (such as ++ and +=).

Arithmetic operators:
The Arithmetic operators are:

Operator Description
+ Addition
- Subtraction
* Multiplication
/ Division
% Modulus (division remainder)
++ Increment
-- Decrement

PHP Code & examples:
<?php
$var1 = 25 + 5 ; // returns 30
$var2 = $var1 / 5 ; // returns 6
$var3 = $var1 + $var2 ; // returns 36
?>

Assignment operators:
The Assignment operators are used to facilitate assigning values to variables:

Operator Description
+= Addition and Assignment
-= Subtraction and Assignment
*= Multiplication and Assignment
/= Division and Assignment
% Modulo and Assignment
.= Concatenation and Assignment

PHP Code & examples:
<?php
$var = 20 ;

$var = $var + 5 ; // returns 25
// We can use the addition and assignment
$var += 5 ; // returns 25
//these two methods return the same result, but as you see, the second is shorter and better !
?>

Comparison Operators:
The Comparison Operators returns a value true or false after comparing two values:

Operator Description
== is equal to
!= is not equal
>
is greater than
< is less than
>= is greater than or equal ro
<= is less than or equal to

the comparaison operators are the most of time used in conditions:
<?php
$var = 20 ;
if ($var1==$var2)
// this instruction will be executed only if $var1 is equal to $var2
if ($var1!=$var2)
// this instruction will be executed only if $var1 is not equal to $var2
if ($var1<$var2)
// this instruction will be executed only if $var1 is less than $var2

// and this is also possible:
$var = ($var1==$var2);
?>

Logical Operators:
The logical Operators are used in conditions, they make a relation between two or more condition. Logical operations are also know as Boolean operators:

Operator Description
&& And: returns true only if two operands (conditions/expressions) are trues
||
Or: returns true if at least one of the two operands returns true
!
Not: if the operand is true, returns false, else returns true
xor
Xor: returns true if only one of the operands returns true. If the two operands are true, it returns false.

Increment and decrement Operators:
The logical Operators are used in conditions, they make a relation between two or more condition. Logical operations are also know as Boolean operators:

Operator Description
++$var Increments the variable value before it is used in rest of expression
--$var
Decrements the variable value before it is used in rest of expression
$var++
Increments the variable value after it is used in rest of expression
$var--
Decrements the variable value after it is used in rest of expression

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