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Operators in PHP

An operator can be defined as a symbol which is used to perform a particular operation between operands.

PHP provides a variety of operators described as follows.

Arithmetic Operators
Assignment Operators
Comparison Operators
Increment/Decrement Operators
Logical Operators
String Operators
Array Operators

☞ Arithmetic operators

Arithmetic operators are used to perform arithmetic operations between two operands.

Operator	Description
`+ (addition)`	Add two operands
`- (subtraction)`	Subtract right operand from the left
`*(multiplication)`	Multiply two operands
`/ (divide)`	Divide left operand by the right one (always results into float)
`%( reminder)`	Modulus - remainder of the division of left operand by the right
`** (exponent)`	Exponent - left operand raised to the power of right

☞ Assignment Operators

The assignment operators are used to assign the value of the right expression to the left operand.

Operator	Description
`= (Assigns to)`	Assigns values from right side operands to left side operand.
`+= (Assignment after Addition)`	It adds right operand to the left operand and assign the result to left operand.
`-= (Assignment after Subtraction)`	It subtracts right operand from the left operand and assign the result to left operand.
`*= (Assignment after Multiplication)`	It multiplies right operand with the left operand and assign the result to left operand.
`/= (Assignment after Division)`	It divides left operand with the right operand and assign the result to left operand.
`%= (Assignment after Modulus)`	It takes modulus using two operands and assign the result to left operand.
`**= (Assignment after Exponent)`	Performs exponential (power) calculation on operators and assign value to the left operand.

☞ Comparison operators

Comparison operators are used to comparing the value of the two operands and returns boolean true or false accordingly.

Operator	Description
`== (Equal to)`	Equal to - True if both operands are equal.
`!= (Not equal to)`	Not equal to - True if operands are not equal.
`<= (Less than or equal)`	Less than or equal to - True if left operand is less than or equal to the right
`>= (Greater than or equal)`	Greater than or equal to - True if left operand is greater than or equal to the right
`< (Less than)`	Less than - True if left operand is less than the right
`> (Greater than)`	Greater than - True if left operand is greater than the right
`=== (Indentical)`	Indentical - True if both operands have same value and datatype.
`!== (Not Indentical)`	Not Indentical - True if both operands doesn't have same value and datatype..

☞ Increment/Decrement operators

Increment/Decrement operators are used to increment or decrement the value of the operand.

Operator	Description
`++ (Increment)`	Increment - It increments the value of operand by one.
`-- (Decrement)`	Decrement - It decrements the value of operand by one.

☞ Logical Operators

The logical operators are used primarily in the expression evaluation to make a decision.

Operator	Description
`and (or) && (logical and)`	Returns True if both statements are true
`or (or) \|\| (logical or)`	Returns True if one of the statements is true
`not (or) ! (logical not)`	Reverse the result, returns False if the result is true

☞ String operators

String operators are used to concatenate two strings.

Operator	Description
`. (Concatenation)`	It concatenates left operand and right operand.
`.= (Assignment after Concatenation)`	It concatenates left operand and right operand and assign the result to left operand.

☞ Array operators

Array operators are used to perform various operations on arrays.

Operator	Description
`+ (Union)`	It combine two arrys.
`== (Equal to)`	Equal to - True if both operands(arrays) are equal.
`!= (Not equal to)`	Not equal to - True if operands(arrays) are not equal.
`=== (Indentical)`	Indentical - True if both operands(arrays) have same value and datatype.
`!== (Not Indentical)`	Not Indentical - True if both operands(aarays) doesn't have same value and datatype..

Example: "OperatorDemo.php"


<html>

<head>

<title>Operators Demo</title>

</head>

<body>

<?php

$a=10;

$b=5;

//Arithmetic operators

$c=$a+$b;

echo "Addition is :$c <br/>";

$c=$a-$b;

echo "Subtraction is :$c <br/>";



//Increment/Decrement Operators

$c=$a++;

echo "Increment is :$c <br/>";

$c=$a--;

echo "Decrement is :$c <br/>";



//Assignment Operators

$c+=$a;

echo " Add Assignment is :$c <br/>";

$c-=$a;

echo "Sub Assignment is :$c <br/>";



//Comparison operators

echo "$a > $b  is : ".($a>$b)."<br/>";

echo "$a < $b  is : ".($a<$b)."<br/>";



//String operators

$str1="Study";

$str2="Glance";

$str3=$str1.$str2;

echo "Combined String : $str3 <br>";

 

//Logical Operators

echo "$a > $b and $a < $c   is : ".($a>$b && $a<$c)."<br/>";

echo "$a > $b or $a < $b   is : ".($a>$b || $a<$b)."<br/>";

?>

</body>

</html>

Output :

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