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exceptions with prepare

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I'd love to use anonymous placeholders on my ecommerce site project.  I am writing half with php and half with golang.  On the three examples below, when run, gives the following exception, " Error: Call to a member function execute() on string. "  I tried it with a decimal too.  Thanks in advance.

$stmt = $dbo->prepare = ("SELECT * FROM products WHERE ProductName = ?");
//this one calls exception

$stmt = $dbo->prepare = ("SELECT * FROM products WHERE ProductName = ?");
//this one calls exception
$stmt->bindParam(1, $productID, PDO::PARAM_INT);

$stmt = $dbo->prepare = ("SELECT * FROM products WHERE ProductName = ?");
//this one calls exception
$stmt->bindValue(1, $productID, PDO::PARAM_INT);

Here is the rest of the code :

$filename = "";
$keyword1 = $_GET['keyword'];
$titleOfSelectedDropDown = $_GET['val1'];
$fileID = "";
$imageID = "a";
$displayID = "";
$keyword1 = "test";
$titleOfSelectedDropDown = "cc";

$host = 'localhost';
$user = 'root';
$pass = '';
$database = 'ecommerce';

$options = array(

$gKeyword1 = "";
$gKeyword2 = "";
$gKeyword3 = "";

$key1ID = "";
$key2ID = "";
$key3ID = "";

$string1 = "<center><h1><u>Search Results</u><h1></center></p>";

$dbo = new PDO("mysql:host=$host;dbname=$database", $user, $pass, $options);

$stmt = $dbo->prepare = ("SELECT * FROM products WHERE ProductName = ?");
$test = "1";
$stmt->execute([ $test ]);


Edited by JoshEir
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