Subtracting Two Numbers

There are three methods to subtract two numbers:

Subtraction in simple code in PHP
Subtraction in form in PHP
Subtraction without using arithmetic operator (+).

Subtraction in Simple Code

Subtraction of two numbers 30 and 15 is shown.

Example:

<?php
$x=30;
$y=15;
$z=$x-$y;
echo "Difference: ",$z;
?>

Output:

Subtraction in Form

By inserting values in the form two numbers can be subtracted.

Example:

<html>
<body>
<form method="post">
Enter First Number:
<input type="number" name="number1" /><br><br>
Enter Second Number:
<input type="number" name="number2" /><br><br>
<input  type="submit" name="submit" value="Subtract">
</form>
<?php
    if(isset($_POST['submit']))
    {
        $number1 = $_POST['number1'];
        $number2 = $_POST['number2'];
        $sum =  $number1-$number2; 
        echo "The difference of $number1 and $number2 is: ".$sum;
    }
?>
</body>
</html>

Output:

Subtraction in Form without (-) Operator

By inserting values in the form two numbers can be subtracted but without using (-) operator.

Example:

<body>
<form>	 
Enter First Number:
<input type="number" name="number1" /><br><br>
Enter Second Number:
<input type="number" name="number2" /><br><br>
<input  type="submit" name="submit" value="Subtract">
</form>
 </body>
<?php
	
@$number1=$_GET['number1'];	
@$number2=$_GET['number2'];
for ($i=1; $i<=$number2; $i++)	
{	 
 $number1--; 	
} 	 
echo "Difference=".$number1;
?>

Output: