Writing to Heredoc from Text Area Form

I can't seem to get heredoc to populate correctly with variables through
a form.

<textarea name="Template" rows="10" cols="80">Template Here</textarea>

Contents could be something like: I want to replace $myarray[0] and
another variable $myarray[1]

I call heredoc this way:

$hubarray = explode("\n", $contents);
$template = $_POST['Template'];

foreach ($hubarray as $val) {
$hostarray = explode(",", $val);

$output = <<<EOT
$template
EOT;

I'm feeding it a file that has multiple rows separated by \n as array 1
and within those rows are fields separated by "," for array 2. I'm
trying to iterate through the arrays and populate heredoc($template)
accordingly.
.

Relevant Pages

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