📄 7-3.php
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<html>
<head><title>Temperature Conversion</title></head>
<body>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'GET') {
?>
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="POST">
Fahrenheit temperature:
<input type="text" name="fahrenheit" /> <br />
<input type="submit" name="Convert to Celsius!" />
</form>
<?php
} elseif ($_SERVER['REQUEST_METHOD'] == 'POST') {
$fahr = $_POST['fahrenheit'];
$celsius = ($fahr - 32) * 5/9;
printf("%.2fF is %.2fC", $fahr, $celsius);
} else {
die("This script only works with GET and POST requests.");
}
?>
</body>
</html>
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