PHP Operators - Arithmetic operator, Assignment Operator, Increment-decrement Operator

• PHP Operators
  • Example of Operator and Operands
• Types of Operators
  • Arithmetic Operator
  • Examples of Arithmetic Operator
    • Problem 1: Summation of Two number: Sum of 10 and 20
    • Problem 2: Division of Two number: 20 divide by 5
    • Problem 3: Exponentiation of Two number: 5 to the power 3
  • Assignment Operator
    • Problem 4: Summation and assign
  • Increment/Decrement Operator
  • String Operator

¶PHP Operators

To work with PHP variables and make any operations, PHP operators are used. Operators take one or more values (Operands/Variables) and yields another value. After making, we can call that an expression.

¶Example of Operator and Operands

<?php
   $summation = 10 + 30; 
   echo $summation; // 40
?>

In the above example -

1. 10 = Operand
2. 20 = Operand
3. + = Operator

Or, this could be also done with Variable -

<?php
$number1 = 10;
$number2 = 30;
$summation = $number2 / $number1;  // Here, / is the Division operator
echo $summation; // 3
?>

In this line -

$summation = $number2 / $number1;

$number1 and $number2 are variables and / is the Division operator.

¶Types of Operators

According to operator values it takes, we can distinguish them below types -

1. Arithmetic Operator
2. Assignment Operator
3. Increment-Decrement Operator
4. String Operator
5. Logical Operator
6. Comparison Operator
7. Conditional Operator
8. Bitwise Operator
9. Array Operator
10. Type Operator
11. Error Control Operator
12. Execution Operator.

We’ll discuss only the First three operators in this class. Others will be discussed later, on specific part.

¶Arithmetic Operator

Arithmetic operators are the basic mathematic arithmetics actually. Let’s get the list of arithmetic operators -

¶Examples of Arithmetic Operator

¶Problem 1: Summation of Two number: Sum of 10 and 20

$number1 = 10;
$number2 = 20;

echo "Summation = " . $number1 + $number2;

Output:

¶Problem 2: Division of Two number: 20 divide by 5

$number1 = 20;
$number2 = 5;

echo "Division = " . $number1 / $number2;

Output:

¶Problem 3: Exponentiation of Two number: 5 to the power 3

$number = 5;
$power = 3;

echo "Exponentiation = " . $number ** $power;

Output:

¶Assignment Operator

Assignment operators are used to assign value on variable.

**Example: **

<?php
$name = "Jhon"; // here = is the assignment operator.
?>

The basic assignment operator is = (equal to). It actually means that the left operand ($name) gets set to the value of the expression on the right (Jhon).
All other assignment operators are actually made from this concept. Let’s get all assignment operators:

¶Problem 4: Summation and assign

$a = 10;
$a += 5;

echo "a = " . $a;

Output:

¶Increment/Decrement Operator

Increment or Decrement operators are another kind of PHP operators which used to increase or decrease PHP variables value.

There are two types increment and decrement operator actually.

$a = 5;
echo $a++; // 5
echo $a; // 6
			  

$a = 5;
echo ++$a; // 6
echo $a; // 6
			  

$a = 5;
echo $a--; // 5
echo $a; // 4
			  

$a = 5;
echo --$a; // 4
echo $a; // 4
			  

Example:

<?php
$a = 5;
echo $a++; // 5
echo $a; // 6

$b = 20;
echo ++$b; // 21
echo $b; // 21

?>

¶String Operator

To manipulate strings or perform any operations on strings, String operator is used.

There are two types string operator actually.

$name = "Jhon";
echo "Hello " . $name;
// Hello Jhon
			  

$welcome_text = "Hello";
$name = "Jhon Doe";
$welcome_text .= $name;
echo $welcome_text;
// Hello Jhon Doe
			  

Example:

<?php
$name = "Jhon";
echo "Hello " . $name; // Hello Jhon

$welcome_text = "Hello ";
$name = "Jhon Doe";
$welcome_text .= $name;
echo $welcome_text; // Hello Jhon Doe

?>