Passing parameter inside the method in the foreach

Question

I have the index that contains my class call CRUD and the foreach calling the class method crud. But within the foreach I’m trying to pass the table name parameter, but it shows nothing. If I take the parameter and put the table name inside the method, it works well. I don’t know what I do! =/

Index:

<?php
     require_once('classes/crud.class.php');
     $mostrarpar = new crud();

?>
<?php foreach ($mostrarpar->Listar('moedas_par') as $res) { ?>
     <li><?php echo $res['par_nome']; ?></li>
<?php } ?>

CRUD:

public function Listar($table) {
    $this->query = $this->setConn()->prepare("SELECT * FROM'.$table.'");
    $this->query->execute();
    return $this->query->fetchall(PDO::FETCH_ASSOC);
}