EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 600+ Courses All in One Bundle
  • Login

Swapping in PHP

By Priya PedamkarPriya Pedamkar

Home » Software Development » Software Development Tutorials » PHP Tutorial » Swapping in PHP

Swapping in PHP

Introduction to Swapping in PHP

In this article, we will learn the swapping of numbers in PHP. We will learn how we define swapping, we will learn how to code to swap two numbers, how to swap more than two numbers and three numbers and how to swap numbers with or without temporary variables and more.

Let us begin with the definition first.

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

“Swapping in PHP is a term defined as interchanging of values.”

Swapping of two numbers is a process to exchange two values using or without using a temporary variable. I hope these examples are useful to all the programmers who want to learn the concept of swapping.

How to Swap Two Numbers in PHP?

There are two ways to swap numbers. These numbers hold numerical values.

  • Swapping two numbers with a temporary variable.
  • Swapping two numbers without a temporary variable.

Suppose we have one variable holding a value 10,

number1 = 10 ;

And the other variable holding a value 20,

number2 = 20;

On swapping of these two numbers, the result should be,

number1 =20

number2= 10

This is possible with the use of the third temporary variable and without a temporary variable also. Swapping two numbers can be done using +, -, *, / operators.

1. Swapping Two Numbers with a Temporary Variable

Code:

// Example of swapping of two numbers using a temporary variable
<?php
// Declaring two variables
$num1 = 100;
$num2 = 200;
// using echo statement print the variables before swapping two numbers
echo "<br>"."Before Swap";
echo “<hr>”;
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo “<hr>”;
// declaring temporary variable to be zero
$temp = 0;
// performing swap of numbers
$temp = $num1;
$num1 = $num2;
$num2 = $temp;
//using the echo statement print the variables after swapping the numbers
echo "<br>"."After Swap";
echo “<hr>”;
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
?>

Popular Course in this category
PHP Training (5 Courses, 3 Project)5 Online Courses | 3 Hands-on Project | 28+ Hours | Verifiable Certificate of Completion | Lifetime Access
4.5 (6,082 ratings)
Course Price

View Course

Related Courses
Java Servlet Training (6 Courses, 12 Projects)All in One Software Development Bundle (600+ Courses, 50+ projects)

Output:

Temporary Variable

2. Swapping Two Numbers without Temporary Variable

Code:

<?php
// Example of swapping of two numbers without using a temporary variable
// Declaring two variables
$num1 = 100;
$num2 = 200;
// using echo statemnt print the variables before swapping two numbers
echo "<br>"."Swap done without using temparory variable";
echo "<hr>";
echo "<br>"."Before Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo "<hr>";
// performing swap of numbers
$num1 = $num1 - $num2;
$num2 = $num1 + $num2;
$num1 = $num2 - $num1;
//using the echo statement print the variables after swapping the numbers
echo "<br>"."After Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
?>

Output:

Swapping in PHP-1.2

3. Swapping of two numbers using a function like list() with array()

Code:

<?php
// Example of swapping of two numbers using list() with array()
// Declaring two variables
$num1 = 100;
$num2 = 200;
// using echo statement print the variables before swapping two numbers
echo "<br>"."Swap done without using predefined functions";
echo "<hr>";
echo "<br>"."Before Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo "<hr>";
// performing swap of numbers
list($num1, $num2) = array($num2, $num1);
//using the echo statement print the variables after swapping the numbers
echo "<br>"."After Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
?>

Output:

Function

How to Swap Three Numbers in PHP?

There are two ways to swap numbers. These numbers hold numerical values.

  • Swapping three numbers with a temporary variable.
  • Swapping three numbers without a temporary variable.

1. Swapping Three Numbers using Temporary Variable

Now that we have learned swapping of two numbers, in a similar way we learn swapping of three numbers now. The following example demonstrates how a temporary(temp) variable is used to swap three numbers.

Code:

<?php
// Example of swapping three numbers using temporary variable
// Declaring three variables
$num1 = 100;
$num2 = 200;
$num3 = 300;
// using echo statement print the variables before swapping three numbers
echo "<br>"."Swap done without using temporary variable";
echo "<hr>";
echo "<br>"."Before Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo "<br>"."Value of third number is  = ". $num3;
echo "<hr>";
// performing swap of numbers
//assign first number the total of three numbers
$temp = $num1;
$num1 = $num2;
$num2 = $num3;
$num3 = $temp;
//using the echo statement print the variables after swapping the numbers
echo "<br>"."After Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo "<br>"."Value of third number is  = ". $num3;
?>

Output:

Swapping in PHP-1.4

2. Swapping Three Numbers Without Using Temporary Variable

The logic here is to calculate the total sum and assign it to a $num1 variable.

And then,

calculate the value of $num1, assign this value to $num2,

calculate the value of $num2, assign this value to $num3,

calculate the value of $num3, and assign this value to $num1 again.

Code:

<?php
// Declaring three variables
$num1 = 100;
$num2 = 200;
$num3 = 300;
// using echo statement print the variables before swapping three numbers
echo "<br>"."Swap done without using temporary variable";
echo "<hr>";
echo "<br>"."Before Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo "<br>"."Value of third number is  = ". $num3;
echo "<hr>";
// performing swap of numbers
//assign first number the total of three numbers
$num1 = $num1 + $num2 + $num3;
$num2 = $num1 - ($num2 + $num3);
$num3 = $num1 - ($num2 + $num3);
$num1 = $num1 - ($num2 + $num3);
//using the echo statement print the variables after swapping the numbers
echo "<br>"."After Swap";
echo "<hr>";
echo "<br>"."Value of first number is  = ". $num1;
echo "<br>"."Value of second number is  = ". $num2;
echo "<br>"."Value of third number is  = ". $num3;
?>

Output:

Swapping in PHP-1.5

Conclusion

I hope this article is useful to all the programmers who wish to learn swapping of numbers. This article has both swappings of two and three numbers with appropriate examples. These examples if practiced will help you learn the concept and help you remember the logic as well.

Recommended Articles

This is a guide to Swapping in PHP. Here we discuss how to swap two or three numbers with or without using temporary variables along with its examples. You may also look at the following articles to learn more –

  1. Sessions in PHP
  2. Patterns in PHP
  3. Cookie in PHP
  4. Overloading in PHP

PHP Training (5 Courses, 3 Project)

5 Online Courses

3 Hands-on Project

28+ Hours

Verifiable Certificate of Completion

Lifetime Access

Learn More

0 Shares
Share
Tweet
Share
Primary Sidebar
PHP Tutorial
  • Programs
    • Patterns in PHP
    • Star Patterns in PHP
    • Swapping in PHP
    • Fibonacci Series PHP
    • Factorial in PHP
    • Reverse String in PHP
    • Square Root in PHP
    • Random Number Generator in PHP
    • Palindrome in PHP
    • Prime Numbers in PHP
    • Armstrong Number in PHP
    • Socket Programming in PHP
    • Login Page in PHP
    • PHP Login Template
    • PHP Object to String
  • PHP Basic
    • Introduction To PHP
    • What is PHP
    • PHP Keywords
    • Advantages of PHP
    • Career In PHP
    • Comments in PHP
    • PHP Commands
    • PHP Frameworks
    • PHP Compiler
    • Variables in PHP
    • PHP Superglobal Variables
    • PHP Versions
    • Object in PHP
    • PHP Object Injection
    • What is Drupal
    • Top PHP Frameworks
    • WebStorm IDE
    • What is phpMyAdmin?
    • PhpStorm
    • Install phpMyAdmin
    • Phalcon Model
  • Data Types
    • PHP Data Types
    • PHP Integer
    • PHP Booleans
  • Operators
    • PHP Operators
    • Arithmetic Operators in PHP
    • Comparison Operators in PHP
    • Logical Operators in PHP
    • Bitwise Operators in PHP
    • Ternary Operator in PHP
    • PHP String Operators
  • Control Statements
    • Control Statement in PHP
    • PHP if Statement
    • if else Statement in PHP
    • elseif in PHP
    • PHP Switch Statement
    • Continue in PHP
    • Break in PHP
  • Loops
    • PHP Loops
    • For Loop in PHP
    • PHP Do While Loop
    • PHP While Loop
    • While Loop in PHP
    • Foreach Loop in PHP
  • Constructor
    • Constructor in PHP
    • Destructor in PHP
  • State Management
    • Cookie in PHP
    • Sessions in PHP
  • Array
    • What is PHP Array
    • Arrays in PHP
    • 2D Arrays in PHP
    • Associative Array in PHP 
    • Multidimensional Array in PHP
    • Indexed Array in PHP
    • PHP Array Functions
    • PHP unset Array
    • PHP Append Array
    • PHP Array Search
    • PHP Split Array
    • PHP array_push()
    • PHP array_pop()
  • Functions
    • Functions in PHP
    • PHP Math Functions
    • PHP Recursive Function
    • PHP String Functions
    • Hashing Function in PHP
    • Date Function in PHP
    • PHP Anonymous Function
    • Calendar in PHP
    • PHP Call Function
    • PHP Pass by Reference
    • PHP list
    • PHP ucfirst()
    • PHP ucwords()
    • trim() in PHP
    • isset() Function in PHP
    • PHP replace
    • PHP fpm
    • preg_match in PHP
    • PHP preg_replace()
    • PHP ob_start()
    • PHP Reflection
    • PHP Split String
    • PHP URL
    • PHP preg_match_all
    • PHP strtoupper()
    • PHP preg_split()
    • PHP substr_replace()
    • PHP setlocale()
    • PHP substr_count()
    • PHP Serialize
    • PHP strlen()
    • PHP async
    • PHP Date Time Functions
    • PHP timezone
    • PHP Data Object
    • print_r() in PHP
    • PHP header()
    • PHP strip_tags()
    • PHP chop()
    • PHP MD5()
    • PHP unset()
    • PHP crypt()
    • PHP wordwrap()
    • PHP is_null()
    • PHP strtok()
    • PHP bin2hex()
    • PHP parse_str()
    • PHP levenshtein()
    • PHP addslashes()
    • PHP strtotime
    • PHP strpos
    • PHP sha1()
    • PHP explode()
    • PHP sscanf()
    • PHP require_once
    • PHP Zip Files
    • PHP $_SERVER
    • PHP $_POST
    • PHP Include and Require
    • PHP POST Method
  • Advanced
    • Overloading in PHP
    • Overriding in PHP
    • Method Overloading in PHP
    • Inheritance in PHP
    • Multiple Inheritance in PHP
    • PHP Interface
    • Encapsulation in PHP
    • PHP Constants
    • PHP Magic Constants
    • PHP Regular Expressions
    • PHP GET Method
    • PHP Annotations
    • PHP Encryption
    • PHP file Functions
    • PHP readfile
    • PHP?Write File
    • PHP Append File
    • PHP Type Hinting
    • PHP Filters
    • PHP Float
    • PHP Form
    • PHP Form Builder
    • PHP Form Validation
    • Sorting in PHP
    • PHP usort()
    • Sort string PHP
    • PHP Stack Trace
    • PHP Stack Overflow
    • PHP Pagination
    • PHP implode
    • Polymorphism in PHP
    • Abstract Class in PHP
    • PHP Final Class
    • PHP Custom Exception
    • error_reporting() in PHP
    • PHP Log Errors
    • Access Modifiers in PHP
    • PHP Change Date Format
    • Static Method in PHP
    • PHP File Handling
    • PHP Output Buffering
    • Get IP Address in PHP
    • PHP Open File
    • Upload a File in PHP
    • String in PHP
    • Public Function in PHP
    • Private in PHP
    • Protected in PHP
    • basename in PHP
    • Validation in PHP
    • PHP mail()
    • PHP Email Form
    • PHP Directory
    • PHP Create Session
    • PHP include_once
    • PHP json_decode
    • PHP XMLWriter
    • PHP XML Reader
    • PHP XML Parser
    • PHP XML into Array
    • Phalcon Framework
  • Database
    • PHP Database Connection
    • How to Connect Database to PHP
  • Interview Questions
    • PHP Interview Questions
    • PHP OOP Interview Questions
    • CakePHP Interview Questions
    • Core PHP Interview Questions

Related Courses

PHP Training Course

Java Servlet Training

Software Development Course Training

Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Java Tutorials
  • Python Tutorials
  • All Tutorials
Certification Courses
  • All Courses
  • Software Development Course - All in One Bundle
  • Become a Python Developer
  • Java Course
  • Become a Selenium Automation Tester
  • Become an IoT Developer
  • ASP.NET Course
  • VB.NET Course
  • PHP Course

© 2020 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA Login

Forgot Password?

EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you
Book Your One Instructor : One Learner Free Class

Let’s Get Started

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you
EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

Special Offer - PHP Training (5 Courses, 3 Project) Learn More