Example : 1
This PHP script demonstrates a simple way to swap the values of two variables.
- The script first initializes two variables, `$a` and `$b`, with the values 5 and 10, respectively.
- It then prints the values of `$a` and `$b` before the swap.
- To perform the swap, the script introduces a temporary variable `$temp`. It assigns the value of `$a` to `$temp`, then assigns the value of `$b` to `$a`, and finally assigns the value of `$temp` to `$b`. At this point, the values of `$a` and `$b` have been swapped.
- The script then prints the values of `$a` and `$b` after the swap.
This script is a simple demonstration of how to swap two variables in PHP. It's a great exercise for those learning PHP and wanting to improve their understanding of variable assignment. Please note that the output will be different if you change the initial values of `$a` and `$b`.
<?php
$a = 5;
$b = 10;
echo "Before swapping: a = $a, b = $b\n";
// Swap the variables
$temp = $a;
$a = $b;
$b = $temp;
echo "After swapping: a = $a, b = $b\n";
?>Output :
Before swapping: a = 5, b = 10
After swapping: a = 10, b = 5
Example : 2
This PHP script demonstrates a way to swap the values of two variables without using a temporary variable. However, it uses a third variable `$c` as a constant.
- The script first initializes three variables, `$a`, `$b`, and `$c`, with the values 10, 20, and 30, respectively.
- It then performs the swap operation in three steps:
1. `$a` is updated to the sum of `$a`, `$b`, and `$c`.
2. `$b` is updated to the new value of `$a` minus the original values of `$b` and `$c`. This gives `$b` the original value of `$a`.
3. `$a` is updated to the new value of `$a` minus the new value of `$b` and the original value of `$c`. This gives `$a` the original value of `$b`.
- Finally, the script prints the new values of `$a` and `$b`.
This script is a demonstration of how to swap two variables in PHP without using a temporary variable, but with the help of a constant. It's a great exercise for those learning PHP and wanting to improve their understanding of variable assignment. Please note that the output will be different if you change the initial values of `$a`, `$b`, and `$c`.
<?php
$a = 10;
$b = 20;
$c = 30;
$a = $a + $b + $c;
$b = $a - $b - $c;
$a = $a - $b - $c;
echo "Value of A is " . $a . '<br/>';
echo "Value of B is " . $b . '<br/>';
?>Output :
Value of A is 20
Value of B is 10