table->set_heading not doing anything

I'm trying to use the table library and it looks very promising, however, I cant seem to modify the template. It looks simple enough. Too simple actually. I can't see anything to troubleshoot. It's just one line of code:

Code:

$this->table->set_template(array('table_open' => '<table class="table table-hover table-condensed">'));
$this->table->set_heading('id', 'Phone', 'Username', 'First', 'Last', 'Email', 'Created');
if(isset($users))
 foreach($users as $user)
    $this->table->add_row($user->id, $user->phone, $user->username, $user->first_name, $user->last_name, $user->email, $user->register_date);
echo $this->table->generate();

The above code works fine without the set_template call and adding the call makes no difference. I've also tried using set_template to change other elements and none of them do anything. Any ideas what I might be doing wrong?

You should be setting the template like this:

PHP Code:

$template = array(
        'table_open' => '<table border="1" cellpadding="2" cellspacing="1" class="mytable">'
);

$this->table->set_template($template); 


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