Upper Case Using PHP

Example :
In HTML File
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<body>
<form action="cases.php" method="post">
Type any word<input type="text" name="word"/>
<input name="submit" type="submit" value="lowercase"/>
</form>
</body>
</html>
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