PHP Example
Screen shot
Integer value validation
<?php
if(isset($_POST[\'btn\']))
{
if(strcmp($_POST[\'age\'],strval(intval($_POST[\'age\']))))
echo \"Age should be numeric\";
}
?>
<html>
<head>
<title>php example</title>
</head>
<body>
<form name=\"frm\" action=\"\" method=\"post\">
Enter Age<input name=\"age\" type=\"text\" /><br />
<input name=\"btn\" type=\"submit\" value=\"Submit\" />
</form>
</body>
</html>

You can download source code here