PHP: How to call a stored procedure

The following code snippet was created in MySQL Workbench:

	SELECT * FROM customers;
END //

CALL getCustomers(); // This works just fine, I get the result set

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But I'm having a problem on the PHP side. Here's the code in PHP:

    $stmt = $db->prepare("call getCustomers()");
    $result = $stmt->execute();
    while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
        echo $row['custid'] . '<br/>';

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I am getting a PHP error that says, "Fatal error: Call to a member function fetch() on boolean in C:\xampp\htdocs\newdimension\public\DBPrep.php".

Can someone please tell me what I'm doing wrong? Thanks.
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$result = $db->query($sql);
while ($row = $result->fetch() ) {
        echo $row['custid'] . '<br/>';

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use prepare if you need to supply arguments to the stored procedure:

You are calling the fetch() on $result instead of on $stmt.
You need to do a $stmt->fetch(PDO::FETCH_ASSOC) and not a $result->fetch(PDO::FETCH_ASSOC). $result is actually a boolean as returned by the PDO::execute statement.

That said, it might be a goot idea to add some error handling as well...
    $stmt = $db->prepare("call getCustomers()");
    if($stmt->execute()) {
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
            echo $row['custid'] . '<br/>';
    }else {
        echo "\nPDOStatement::errorInfo():\n";
        $arr = $stmt->errorInfo();

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elepilAuthor Commented:
I'm learning how to use both PDO and mysqli, and I keep getting confused which object returns the results.

Thanks for the help, guys.
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