Try following example to understand all the assignment 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>Assignment Operators</title><head>
<body>
<?php
$a = 42;
$b = 20;
$c = $a + $b; /* Assignment operator */
echo "Addtion Operation Result: $c <br/>";
$c += $a; /* c value was 42 + 20 = 62 */
echo "Add AND Assigment Operation Result: $c <br/>";
$c -= $a; /* c value was 42 + 20 + 42 = 104 */
echo "Subtract AND Assignment Operation Result: $c <br/>";
$c *= $a; /* c value was 104 - 42 = 62 */
echo "Multiply AND Assignment Operation Result: $c <br/>";
$c /= $a; /* c value was 62 * 42 = 2604 */
echo "Division AND Assignment Operation Result: $c <br/>";
$c %= $a; /* c value was 2604/42 = 62*/
echo "Modulus AND Assignment Operation Result: $c <br/>";
?>
</body>
</html>
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This will produce following result
Addtion Operation Result: 62
Add AND Assigment Operation Result: 104
Subtract AND Assignment Operation Result: 62
Multiply AND Assignment Operation Result: 2604
Division AND Assignment Operation Result: 62
Modulus AND Assignment Operation Result: 20
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