无法理解为什么设置数组但处理后数组为空

Line 42 is the error. I'm not sure as to why it keeps saying it's not an array is one section but fails to find the array on line 42. I have tried to change the line to ($_POST['CINS'] as $cNum => $v) and ($CINS as $cNum => $v). Any insight or help would be appreciated.

<?php
$title = "fTest.php";
$action=$_SERVER['PHP_SELF'];
include("html-head.inc");
echo <<<HEREDOC
<header>
<h1>$title</h1>
</header>
HEREDOC;

if (!isset($_POST['submit']))
{ 
        echo "<form method=\"post\" action=\"$action\">";
$CINS = array('101' => "CINS101",
                '108' => "CINS108",
                '121' => "CINS121",
                '251' => "CINS251",
                '254' => "CINS254");
        echo "<p>Please pick your CINS classes:</p>";
        echo "<ul>
";
foreach ($CINS as $key => $value)
{ 
        echo "<li>";
        echo "<input type=\"checkbox\" name=\"CINSc\" value=\"$value\"/>CINS$key"    ;
        echo "</li>
";
}                 
        echo "</ul>
"; 
        echo "<input type=\"reset\" name=\"reset\" value\"Reset\" />";
        echo "<input type=\"submit\" name=\"submit\" value\"Submit\" />";
        echo "</p>";
echo is_array($CINS) ? 'Array' : 'Not an array';
echo "
";
        echo "</form>";
} // ends IF PORTION for ISSET
else      
{         
if (count($_POST['CINS'] > 0 ))
{         
        echo "<h2> Your picks are: </h2>
";
        echo "<ul>
";
echo is_array($CINS) ? 'Array' : 'Not an array';
foreach ($_POST['CINS'] as $cNum => $v)  //This is the error.
{
        echo "\t<li>$v</li>
";
} // end of FOREACH cins
        echo "</ul>
";
} // end of IF count CINS
} // end of ELSE portion for ISSET
?>

Your checkbox name should like below to consider it as an array

<input type="checkbox" name="CINS[]" value = "1" />

The <input> name is an array, and I've found a spare </p> that shouldn't be there.

Your coding style is going to cause A LOT of HEADACHES. I've cleaned it up a bit, I think this style will be much easier to handle.

<?php
$title = "fTest.php";
$action=$_SERVER['PHP_SELF'];
include("html-head.inc");
?>

<header>
<h1><?=$title?></h1>
</header>

<?php if (!isset($_POST['submit'])): ?>
    <?php $CINS = array('101' => "CINS101",
                        '108' => "CINS108",
                        '121' => "CINS121",
                        '251' => "CINS251",
                        '254' => "CINS254"); ?>
    <form method="post" action="<?=$action?>">
        <p>Please pick your CINS classes:</p>
        <ul>
        <?php foreach ($CINS as $key => $value): ?>
            <li>
            <input type="checkbox" name="CINS[]" value="<?=$value?>" />CINS<?=$key?>
            </li>
        <?php endforeach; ?> 
        </ul>
        <input type="reset" name="reset" value"Reset" />
        <input type="submit" name="submit" value"Submit" />
        </p> <!-- THIS TAG IS EXTRA WHERE DID IT COME FROM -->
        <?= is_array($CINS) ? 'Array' : 'Not an array' ?>
    </form>
<?php else if (count($_POST['CINS'] > 0 )): ?>
    <h2>Your picks are: </h2>
    <ul>
    <?= is_array($CINS) ? 'Array' : 'Not an array' ?>
    <?php foreach ($_POST['CINS'] as $cNum => $v): ?>
        <li><?=$v?></li>
    <?php endforeach; ?>
    </ul>
<?php endif; ?>