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In this post I am going to describe the very basic PHP Program which tell us how to swap two numbers without using third variable. This program is very commonly asked in the interviews 7 out of 10 times this type of question are asked in the interviews and it can be very easily made.
<?php
if(isset($_POST['submit'])){
$A= $_POST['A'];// (let the value of A be 10 and B be 20)
$B= $_POST['B'];
$A=$A+$B; //adding the value of both variable in A now A=30
$B=$A-$B; // now the value of B is 10
$A=$A-$B; // now the value of A is 20
echo "Value of A is ".$A."<br>";
echo "Value of B is ".$B;
}
?>
<html>
<head>
<title>Swipe</title>
</head>
<body>
<form action="" method='POST'>
<label for="number">Please Enter the value of A</label>
<input type="text" name="A" value="">
<br><br>
<label for="number">Please Enter the value of B</label>
<input type="text" name="B" value="">
<br><br>
<input type="submit" value="Done" name="submit">
</form>
</body>
</html>
Program Output:
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