PHP Code messes up my Website Page?

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Ncis

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<?PHP

// Total Questions:
// HELP: Set this to number of questions you have.
$number_of_questions = 3;

// The Questions:
$quiz = array( '1' => array ( 'question' => "What's brown & sounds like a bell",
'choices' => array( 'a' => 'Dung', 'b' => 'Doo', 'c' => 'Ding', 'd' => 'Dong' ),
'answer' => "a" ),

'2' => array ( 'question' => "What's brown & sticky",
'choices' => array( 'a' => 'Bogroll', 'b' => 'Doodah', 'c' => 'Stick', 'd' => 'Darkness' ),
'answer' => "c" ),

'3' => array ( 'question' => "What black & white & red all over",
'choices' => array( 'a' => 'Yer Maw', 'b' => 'Yer Paw', 'c' => 'Yer Face', 'd' => 'A Nun falling down the stairs.' ),
'answer' => "d" ),


/* '3' => array ( 'question' => "<%YOUR_QUESTION_HERE%>",
'choices' => array( 'a' => '<%CHOICE_1%>', 'b' => '<%CHOICE_2%>', 'c' => '<%CHOICE_3%>', 'd' => '<%CHOICE_4%>' ),
'answer' => "<%CORRECT_ANSWER_LETTER_HERE%>" ),*/

);

// +-----
// LOGIC
// +-----

if ( ( isset($_POST['action'] ) ) && ( $_POST['action'] == "go" ) ) {

$current_question = $_POST['current_question'];
$next_question = $current_question + 1;

$score = $_POST['score'];

// GET answer, and mark if right.
$answer = $quiz[ $current_question ]['answer'];


if ( $answer == $_POST["q" .$current_question ] ) {

$score = $_POST['score'] + 1;

}

// Increment ready for NEXT question:
$current_question = $next_question;
$next_question = $current_question + 1;

if( $current_question > $number_of_questions ) {

exit("You scored $score out of $number_of_questions. <a href='?'>Restart Quiz</a>");

}

}
else {

$current_question = "1";
$next_question = $current_question + 1;

$score = "0";

}


// +-------------
// THE HTML CODE
// +-------------

echo "<form method='POST'>\n
<input type='hidden' name='action' value='go' />
<input type='hidden' name='current_question' value='$current_question' />
<input type='hidden' name='next_question' value='$next_question' />
<input type='hidden' name='score' value='$score' />\n";

// OUTPUT Question...
echo "{$quiz[ $current_question ]['question']}?<br />\n";

// OUTPUT Choices...
foreach( $quiz[ $current_question]['choices'] as $k => $v ) {

echo "<input type='radio' name='q$current_question' value='$k'> $k: $v<br />\n";

}

echo "<p><input type='submit' value='Next Question'></p>\n";

exit();

?>

-----------------------------------

It keeps messing up my page, there must be a error in it.

Can someone please paste the full code here, fixed up?

Thanks
 
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