Operators are used to perform operations on variables and values. Variables are simply containers for information. In order to do anything useful with them, you need Operators. Operators are symbols that tell the PHP processor to perform certain actions. For example, the addition (+) symbol is an Operators that tells PHP to add two variables or values, while the greater-than(>) symbol is an Operators that tells PHP to compare two values.

PHP supports more than 50 such Operators , ranging from operators for arithmetical
operations to operators for logical comparison and bitwise calculations.

PHP divides the operators into the following groups

1. Arithmetic operators
2. Assignment operators
3. Comparison operators
4. Increment/ Decrement operators
5. Logical operators
6. String operators
7. Array operators

Arithmetic Operators in PhP

The PHP arithmetic operators are used with numeric values to perform common arithmetical operations, such as addition, subtraction, multiplication etc.

Operators	Description
+	Addition
–	Subtraction
*	Multiplication
/	Division
%	Modulus
**	Exponentiation (Introduced in PHP 5.6)

 

Example to use Arithmetic Operator (+) for addition of two numbers

<?php        
$x=10; 
$y=5;
 
//addition
$sum=$x+$y;
echo "sum=".$sum."<br/>";
?>

Similarly we can use all the remaining Arithmatic Operators.

Assignment Operators in PhP

The PHP assignment operators are used with numeric values to write a value to a variable.

Operators	Description
=	The left operand gets set to the value of the expression on the right
+=	Add and assign
-=	Subtract and assign
*=	Multiply and assign
/=	Divide and assign quotient
%=	Divide and assign modulus
.=	Concatenate and assign (its used only for sting)

 

Example to use Add and assign Assignment Operator (+=)

<?php 
 
$x = 500;
 
$x+= 500;
 
echo "sum=".$x."<br/>";
 
?>

Similarly we can use all the remaining Assignment Operators.

Comparison operators in PhP

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

Operators	Description
==	Equal to
===	Equal to and of the same type
!=	Not equal to
<>	Not equal to
!==	Not equal to and of the same type
>	Greater than
<	Less than
>=	Greater than or equal to
<=	Less than or equal to

 

Example to illustrate == and === operators

<?php
$x=10;
$y=10.0;

echo ($x==$y);
//it returns true because both the variable contains same value.
 
echo ($x===$y);
/*it returns false because === strongly compares.
here both variable contain same value i.e 10 but different datatype one is integer and another is float.*/ 
 
?>

Increment/ Decrement operators in PhP

The PHP increment operators are used to increment a variable’s value.

Operators	Description
++$x	Pre-increment
$x++	Post-increment

 

The PHP decrement operators are used to decrement a variable’s value.

Operators	Description
–$x	Pre-decrement
$x–	Post-decrement

 

Logical operators in PhP

The PHP logical operators are used to combine conditional statements.

Operator	Description
and	And
or	Or
xor	Xor
&&	And
||	Or
!	Not

 

Example to use And Operator (&&)

<?php
$name="pardeep";
$pass="pardeeppatel";
 
if($name=="pardeep" && $pass=="pardeeppatel"
{
header('location:https://www.studywarehouse.com');
}
 
else
{
echo "Invalid name or password"; 
}
 
?>

String operators in PhP

PHP has two operators that are specially designed for strings.

Operator	Description
.	Concatenation
.=	Concatenation Assignment

 

Example to use String Operators

<?php
    $name="Pardeep";
    $lastName="Patel";
    echo $name." ".$lastName; 
    
    $a="Hello";
    $a .= " Pardeep!";
    echo $a;
?>

Array operators in PhP

The PHP array operators are used to compare arrays.

Operator	Description
+	Union
==	Equality
===	Identity
!=	Inequality
<>	Inequality
!==	Non-identity

 

Example to use operator in array

<?php   
$a = array("a" => "apple", "b" => "banana");  
$b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");  
$c = $a + $b; // Union of $a and $b  
echo "Union of \$a and \$b : <br />";  
var_dump($c);  
$c = $b + $a; // Union of $b and $a   
echo "<br />Union of \$b and \$a : <br />";  
var_dump($c);  
?>