**Php Operators :**

There are many types of operators in php.

- Arithmetic Operators
- Comparison Operators
- Assignment Operators
- Increment/Decrement Operators
- Logical Operators
- String operators
- Error Control Operators
- Array Operators
- Bitwise Operators
- Type Operators
- Execution Operators
- Error Control Operators

### 1 **Arithmetic Operators**

+ (addition)

- ( subtraction) **This operation work as a subtraction as well as negation**

$a - $b **( this is the example of subtraction)**

-$a **( this is the example of negation that means opposite of $a )**

* (multiplication)

% ( modulus

/ ( division)

** ( exponentiation ) **( This will work in PHP 5.6 version or later)**

** Example of arithmetic operators :**

<?php

$var1 = 100;

$var2 = 200;

$sum = $var1 + $var2;

$subtraction = $var2 - $var1;

$multiplication = $var1 * $var2;

$division = $var2/$var1;

$modulus = $var2%$var1;

echo "Sum = $sum<br>";

echo "Subtraction = $subtraction<br>";

echo "Multiplication = $multiplication<br>";

echo "Division = $division<br>";

echo "modulus = $modulus<br>";

?>

**Output :**

Sum = 300

Subtraction = 100

Multiplication = 20000

Division = 2

modulus = 0

### 2 **Comparison Operators**

== ( Equal )

=== ( Identical )

!= (Not Equal )

!== ( Not Identical )

<> ( Not Equal )

>= ( Greater than or equal to )

<= ( Less than or equal to )

> ( Greater than )

< ( Less than )

**Simple example of the above mentioned operators.**

<?php

$var1 = 100;

$var2 = 100.00;

$var3 = 100.00;

$var4 = 50;

if($var1==$var2){

echo "Equal comparison operator<br>";

}

**/****

** * This condition work if and only if**

** * both operands are same in value as well as data type**

** * In this case $var1 and $var2 are same in value but not in data type.**

** * So this condition will not work.**

** */**

if($var1===$var2){

echo "Identical comparison operator<br>";

}

**/****

** * This condition will work because $var2 and $var3 are same in value as well as data type**

** */**

if($var2===$var3){

echo "Identical comparison operator<br>";

}

if($var1 > 50){

echo "Greater than operator<br>";

}

if($var1 < 50){

echo "Less than operator<br>";

}

if($var1 >= 100){

echo "Greater than or equal operator<br>";

}

if($var1 <= 100){

echo "Less than or equal operator<br>";

}

if($var1 != $var4){

echo "Not equal operator<br>";

}

if($var1 <> $var4){

echo "Not equal operator<br>";

}

if($var1 !== $var2){

echo "Not identical operator<br>";

}

?>

**Output :**

Equal comparison operator

Identical comparison operator

Greater than operator

Greater than or equal operator

Less than or equal operator

Not equal operator

Not equal operator

Not identical operator

**3 Assignment Operators**

= ( This is assignment operator )

**<?php**

$a =100;

echo "Value of a = $a<br>";

$a+=100; **// $a = $a + 100;**

echo "Value of a = $a<br>";

$a-=100; **//$a = $a-100**

echo "Value of a = $a<br>";

$a*=100; ** // $a = $a*100**

echo "Value of a = $a<br>";

**?>**

**Output :**

Value of a = 100

Value of a = 200

Value of a = 100

Value of a = 10000

**4 Increment/Decrement Operators**

++ ( Increment Operator )

- - ( Decrement Operator )

$a++ // $a++ and $a=$a+1 are same

$a-- // $a-- and $a=$a-1 are same

**Understand with simple example.**

1 )

<?php

$a = 100;

echo "Value of a = $a<br>";

/**

* Now you can increase the value of $a by 1

* using $a++( $a++ means $a=$a+1)

*/

$a++;

echo "After increment the value of a = $a<br>";

/**

* Now you can decrease the value of $a by 1

* using $a-- ( $a-- means $a=$a-1

*/

$a--;

echo "After decrement the value of a = $a<br>";

?>

**Output :**

Value of a = 100

After increment the value of a = 101

After decrement the value of a = 100

**5 Logical Operators**

There are three logical operators:

1)** &&** ( And operator works on two operands like $operand1 && $operand2)

2) **||** ( Or operator works on two operands like $operand1 || $operand2)

3)** !** ( Not operator works on one operands like !$operand1)

Lets take a simple example to understand these all three operators.

**You can copy past to check the blow code as well.**

```
<?php
/**
*
* In this block we will try to understand && logical operator
*/
$operand1=true;
$operand2=true;
if($operand1 && $operand2){ // If both are true then its work
echo "Condition is true<br>";
}
$operand1=false;
$operand2=true;
if($operand1 && $operand2){ // If both are true then its work
echo "If condition is true because of both operands are true<br>";
}else{ // If any of the operands or both operands are false then this block will work
echo "Else block will execute because of any of the operands or both operands are false<br>";
}
/**
*
```**Output of the above block is below:**
* Condition is true
* Else block will execute because of any of the operands or both operands are false
*/
/**
* In this block we will try to understand || logical operator
*/
$operand1=false;
$operand2=true;
if($operand1 || $operand2){ // If any one operand is true then this block will work
echo "Condition is true<br>";
}
$operand1=false;
$operand2=false;
if($operand1 || $operand2){ // If any one operand is true then this block will work
echo 'If any one operand is true then this block will work<br>';
}else{ // If both operands are false then this block will work
echo "Else block will execute because of both operands are false<br>";
}
/**
* **Output of the above block is below:**
* Condition is true
* Else block will execute because of both operands are false
*/
/**
* Lets take a example to understand ! (not) operator
*/
$operand1=false;
if(!$operand1){ // This means if not true then this block will work
echo " This means if not true then this block will work<br>";
}
$operand1 =10;
if($operand1==10){
echo "Operand1 value is 10<br>";
}
$operand1 =11;
if($operand1!=10){
echo "Operand1 value is not 10<br>";
}
/**
* **Output of the above block is below:**
* This means if not true then this block will work
* Operand1 value is 10Operand1 value is not 10
*/