PHP Exercises : Swap two variables

PHP : Exercise-31 with Solution

Write a PHP program to swap two variables.

PHP: Swapping two variables

Swapping two variables refers to mutually exchanging the values of the variables. Generally, this is done with the data in memory.

The simplest method to swap two variables is to use a third temporary variable :

define swap(a, b)
    temp := a
    a := b
    b := temp

Sample Solution:

Code : Swap two numbers using a third variable

PHP Code:

<?php
// Declare and initialize two variables
$a = 15;
$b = 27;

// Display the original values of the variables
echo "\nThe number before swapping is:\n";
echo "Number a =" . $a . " and b=" . $b;

// Swap Logic
$temp = $a;
$a = $b;
$b = $temp;

// Display the values after swapping
echo "\nThe number after swapping is: \n";
echo "Number a =" . $a . " and b=" . $b . "\n";
?>

Code: Swap two variables value without using third variable

<?php
// Declare and initialize two variables
$a = 15;
$b = 276;

// Display the values before swapping
echo "\nBefore swapping:  ". $a . ',' . $b;

// Swap Logic using list() and array()
list($a, $b) = array($b, $a);

// Display the values after swapping
echo "\nAfter swapping:  ". $a . ',' . $b."\n";
?>

Sample Output:

The number before swapping is:                              
Number a =15 and b=27                                       
The number after swapping is:                               
Number a =27 and b=15

Flowchart:

PHP Code Editor:

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