Array comparison problem

It’s been awhile since I posted on these forums
but now I have a rather complicated problem and I’m hoping anyone can help me:
I’m trying to code a testing system, where the user will enter data into a HTML form, which posts it to a PHP script
which is supposed to compare the entered data with the correct data stored within a XML file.
The php page is supposed to echo which os the answers are right and which are wrong, using array_diff() and array_intersect()
The PHP code itself looks something like this:

*<?php
$exercise = $_POST[‘exercise’];
$nose = $_POST[‘nose’];
$gold = $_POST[‘gold’];
$black = $_POST[‘black’];
$northwest = $_POST[‘northwest’];
$character = $_POST[‘character’];
$chicken = $_POST[‘chicken’];
$tomarket = $_POST[‘tomarket’];
$translate= array (0 => Array($exercise), 1 => Array($nose), 2 => Array($gold), 3 => Array($black), 4 => Array($northwest), 5 => Array($character), 6 => Array($chicken), 7 => Array($tomarket));
$dom =
domxml_open_mem(file_get_contents(‘test_2.xml’));

foreach ($dom->get_elements_by_tagname(‘palabra’) as
$element) {
$attr = $element->attributes();
foreach ($element->child_nodes() as $e) {
if (isset($e->tagname)) {
if ($e->tagname == ‘uno’) {
$node = $e->first_child();
$uno = htmlspecialchars
($node->node_value());
} elseif ($e->tagname == ‘dos’) {
$node = $e->first_child();
$dos =
htmlspecialchars($node->node_value());
} elseif ($e->tagname == ‘tres’) {
$node = $e->first_child();
$tres =
htmlspecialchars($node->node_value());
} elseif ($e->tagname == ‘cuatro’) {
$node = $e->first_child();
$cuatro =
htmlspecialchars($node->node_value());
} elseif ($e->tagname == ‘cinco’) {
$node = $e->first_child();
$cinco =
htmlspecialchars($node->node_value());
} elseif ($e->tagname == ‘seis’) {
$node = $e->first_child();
$seis =
htmlspecialchars($node->node_value());
} elseif ($e->tagname == ‘siete’) {
$node = $e->first_child();
$siete =
htmlspecialchars($node->node_value());
} elseif ($e->tagname == ‘ocho’) {
$node = $e->first_child();
$ocho =
htmlspecialchars($node->node_value());
}
}
}
$spanish= array (a => Array($uno), b => Array($dos), c => Array($tres), d => Array($cuatro), e => Array($cinco), f => Array($seis), g => Array($siete), h => Array($ocho));
$correct = array_intersect($translate, $spanish);
$wrong = array_diff($translate, $spanish);
echo “<p>You got the following words correct: <font color “00FF00”>”;
echo print_r ($correct);
echo “</font></p>”;
echo “<p>But you got these words wrong!: <font color “FF0000”>”;
echo print_r ($wrong);
echo “</font></p>”;

}
?>*

However the array comparison functions don’t seem to be working;
Can anyone please tell me why? Is there some syntax error I’m making?