PHP Example
Screen shot
To Select Letter from dropdown and print array element.
<?php
if(isset($_POST[\'btnsubmit\']))
{

$a_name=array(\"Amit\",\"Anil\",\"Ajay\",\"Atul\");
$b_name=array(\"Benu\",\"Brijesh\",\"Bipul\");
$c_name=array(\"Charu\",\"Chadan\",\"Chandu\");

if($_POST[\"personname\"]==\'A\')
foreach($a_name as $value)
echo $value.\"<br>\";

if($_POST[\"personname\"]==\'B\')
foreach($b_name as $value)
echo $value.\"<br>\";

if($_POST[\"personname\"]==\'C\')
foreach($c_name as $value)
echo $value.\"<br>\";

}
?>
<html>
<head>
<title>My array</title>
</head>
<body>
<form name=\"frm\" action=\"\" method=\"post\">
<select name=\"personname\">
<option>A</option>
<option>B</option>
<option>C</option>
</select>
<input name=\"btnsubmit\" type=\"submit\" value=\"Submit\">
</form>
</body>
</html>

You can download source code here