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<head>
<title>Feet to meters conversion</title>
</head>
<body>
<?php
$feet = htmlentities($_GET["feet"]);
if ($_GET[feet] != NULL){
echo "<strong>$feet</strong> feet converts to <strong>";
echo $feet * 0.3048;
echo "</strong> meters.<br />";
}
?>
<form action="<?php echo(htmlentities($_SERVER['PHP_SELF'])); ?>" method="GET">
<label>Feet:
<input type="text" name="feet" value="<?php echo $feet; ?>" />
</label>
<input type="submit" value="Convert!" />
</form>
</body>
</html>
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