There are two methods for swapping:
- By using third variable.
- Without using third variable.
<?php $a = 50; $b = 83;
echo "Before swapping:<br><br>";
echo "a =".$a." b=".$b."<br> ";
$third = $a;
$a = $b;
$b = $third;
echo "After swapping:<br><br>";
echo "a =".$a." b=".$b;
?>
Swapping Without using Third Variable
Swap two numbers without using a third variable is done in two ways:
- Using arithmetic operation + and
- Using arithmetic operation * and
- Using arithmetic operation + and –
<?php
$a=567;
$b=789;
echo " Before Swapping:<br>";
echo "Value of a: $a</br>";
echo "Value of b: $b</br>";
$a=$a+$b;
$b=$a-$b;
$a=$a-$b;
echo " After Swapping:<br>";
echo "Value of a: $a</br>";
echo "Value of b: $b</br>";
?>
Using arithmetic operation * and /
<?php
$a=890;
$b=908;
echo " Before Swapping:<br>";
echo "Value of a: $a</br>";
echo "Value of b: $b</br>";
$a=$a*$b;
$b=$a/$b;
$a=$a/$b;
echo " After Swapping:<br>";
echo "Value of a: $a</br>";
echo "Value of b: $b</br>"; ?>
