Write a PHP program to implement simple calculator operations.

<form method="post">

Enter a Number 1: <input type="number" name="t1"><br><br>

Enter a Number 2: <input type="number" name="t2"><br><br>

<input type="submit" name="submit" value="Submit">

</form>

<?php

$n1 = $_POST['t1'];

$n2 = $_POST['t2'];

$sum=$n1+$n2;

echo "Addition=".$sum."<br>";

$sum=$n1-$n2;

echo "Substraction=".$sum."<br>";

$sum=$n1*$n2;

echo "Multiplication=".$sum."<br>";

$sum=$n1/$n2;

echo "Division=".$sum."<br>";

?>