Try following example to understand all the arithmatic operators. Copy and paste following PHP program in test.php file ando keep it in your PHP Server's document root and browse it using any browser.
<html>
<head><title>Arithmetical Operators</title><head>
<body>
<?php
$a = 42;
$b = 20;
$c = $a + $b;
echo "Addtion Operation Result: $c <br/>";
$c = $a - $b;
echo "Substraction Operation Result: $c <br/>";
$c = $a * $b;
echo "Multiplication Operation Result: $c <br/>";
$c = $a / $b;
echo "Division Operation Result: $c <br/>";
$c = $a % $b;
echo "Modulus Operation Result: $c <br/>";
$c = $a++;
echo "Increment Operation Result: $c <br/>";
$c = $a--;
echo "Decrement Operation Result: $c <br/>";
?>
</body>
</html>
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This will produce following result
Addtion Operation Result: 62
Substraction Operation Result: 22
Multiplication Operation Result: 840
Division Operation Result: 2.1
Modulus Operation Result: 2
Increment Operation Result: 42
Decrement Operation Result: 43
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