How To Code A Simple Calculator In PHP

In this php tutorial you will learn how to make a simple PHP calculator

<?php

if($submit)
{
 if($operator == *)
 {
 echo $numa * $numb;
 } elseif($operator == /)
 {
 echo $numa / $numb;
 } elseif($operator == +)
 {
 echo $numa + $numb;
 } elseif($operator == -)
 {
 echo $numa - $numb;
 }
} else { ?>
<form method="POST" action="<?php $_SERVER[PHP_SELF]; ?>">
 <input type="text" name="numa" size="10">
 <select name="operator">
 <option value="+">Add</option>
 <option value="-">Subtract</option>
 <option value="*">Multiply</option>
 <option value="/">Divide</option>
 </select>
 <input type="text" name="numb" size="10">
 <input type="submit" value="Calculate" name="submit">
</form>
<?php } ?>

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