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PHP use of form and retrieve form data

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<html>
<body>
<form action="welcome.php" method="post">
<label for="fname">Name: </label><input type="text" name="fname" id="fname"/>
<label for="age">Age: </label><input type="text" name="age" id="age"/>
<button type="submit">Continue</button>
</form>
</body>
</html>

welcome.php:

<html>
<body>
Welcome <?php echo $_POST['fname']; ?>!<br/>
You're <?php echo $_POST['age']; ?> years old!<br/>
</body>
</html>

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