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<!DOCTYPE html>
<html>
<body>
<pre>
<?php  
$cars = array("Volvo", "BMW", "Toyota");
$cars[1] = "Ford";
var_dump($cars);
?>  
</pre>
</body>
</html>
array(3) {
  [0]=>
  string(5) "Volvo"
  [1]=>
  string(4) "Ford"
  [2]=>
  string(6) "Toyota"
}