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// check_age.php
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<?php
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session_start();
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if (isset($_POST['submit'], $_POST['adult']) && $_POST['adult'] == 1) {
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	$_SESSION['adult'] = 'true';
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	header ('location: index.php');
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}
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?>
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<html>
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<head></head>
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<body>
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<form action="" method="POST">
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<input type="checkbox" name="adult" value="1">
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I am over 21 years old
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<input type="submit" name="submit">
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</form>
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</body>
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</html>
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// has_age.php
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<?php
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session_start();
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if (!isset($_SESSION['adult'])) {
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header('location: check_age.php');
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}
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?>
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// index.php
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// first line 
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require_once 'has_age.php';