PHP - Pdo Prepare

I'm trying to clean up all my functions with any queries which take dynamic parameters using PDO prepared statements. I originally thought I was using prepared statements and was told later I wasn't so it's been on my to-do list to go and clean them up. I have cleaned up a lot of them and tested them and they are working fine. This one is giving me a problem though..

        /*fetch production data*/
	if( isset( $field ) && isset( $type ) && isset( $value ) ) {

		$sql = 'SELECT id, job_number, enterprise, description, line_item, as400_ship_date 
				FROM production_data
				WHERE :field :type :value 
				ORDER BY enterprise, job_number, line_item LIMIT :offset, :records_per_page';
		
		$stmt = $pdo->prepare($sql);
		$stmt->execute( [ 'field' => $field, 'type' => $type, 'value' => $value, 'offset' => $offset, 'records_per_page' => $records_per_page ] );
		
	} else {
		$sql = 'SELECT id, job_number, enterprise, description, line_item, as400_ship_date 
				FROM production_data
				ORDER BY enterprise, job_number, line_item LIMIT '. $offset . ', '. $records_per_page;
		
	}

It takes values from some drop downs (I'm using tabulator to generate a table and this part is related to it's pagination functions)...here is the HTML for those elements.
 

                 <div class="table-controls">
			<div class="form-row">
				<div class="col">
                  
					<label for="filter-field" class="col-form-label-sm">Field: </label>
					<select id="filter-field" class="form-control form-control-sm">
					  <option></option>
					  <option value="Job Number">Job Number</option>
					  <option value="Enterprise">Enterprise</option>
					</select>
				</div>
              
				<div class="col">
					<label for="filter-type" class="col-form-label-sm">Type: </label>
					<select id="filter-type" class="form-control form-control-sm">
					  <option value="like" selected="selected">Like</option>
					  <option value="=">Equal to</option>
					</select>
				</div>
              
				<div class="col">
					<label for="filter-value" class="col-form-label-sm">Value: </label>
					<input id="filter-value" class="form-control form-control-sm" style="float: left;" type="text" placeholder="Value to filter...">
				</div>
              
				<div class="col d-flex align-content-end flex-wrap">
					<button id="filter-clear" class="btn btn-primary btn-sm rounded-0">Clear Filters & Sorting</button>
				</div>
			</div>
		</div>

After attempting to put adjust the query to a prepared statement, I get the following error:

Fatal error: Uncaught PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '? ? ORDER BY enterprise, job_number, line_item LIMIT ?, ?' at line 3 in C:\wamp64\www\test\scripts\order_status.php on line 125

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->execute();

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

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

Here is the rest of the code :

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

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

$options = array(
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_EMULATE_PREPARES => false
);

$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 ]);

I have this at the top of my index.php:

<?php
session_start();
// start of script every time.

//  setup a path for all of your canned php scripts
$php_scripts = '/home/larry/web/test/php/'; // a folder above the web accessible tree
//  load the pdo connection module  
require $php_scripts . 'PDO_Connection_Select.php';
require $php_scripts . 'GetUserIpAddr.php';

//*******************************
//   Begin the script here
$ip = GetUserIpAddr();
if (!$pdo = PDOConnect("foxclone")):
{
	echo "Failed to connect to database" ;
    exit;
}
else:
{
    $stmt = $pdo->prepare("INSERT INTO 'download' ('IP_ADDRESS', 'FILENAME') VALUES (?, ?");
    $stmt->bindParam(1, $ip);
    $stmt->bindParam(2, $filename);  
    $stmt->execute();

}

endif;
//exit();
?>

I'm getting the following error at the $pdo->prepare line:

Fatal error: Uncaught PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''download' ('IP_ADDRESS','FILENAME') VALUES (?, ?' at line 1 in /home/larry/web/test/public_html/index2.php:23 
Stack trace: #0 /home/larry/web/test/public_html/index2.php(23): 
PDO->prepare('INSERT INTO 'do...') #1 {main} thrown in /home/larry/web/test/public_html/index2.php on line 23

I  verified the format of the statement at https://www.w3schools.com/php/php_mysql_prepared_statements.asp but am unsure if it needs to be in the PDO_Connection_Select.php, or it belongs where I have it since the db is already connected.

$sql = "SELECT count(*) FROM posts WHERE MATCH (comments) AGAINST (':words' IN BOOLEAN MODE)";
$stmt = $db->prepare($sql);
$stmt->bindParam(':words', $words);
$stmt->execute();

$stmt = $db->prepare(SELECT count(*) FROM posts WHERE MATCH (comments) AGAINST ('$words' IN BOOLEAN MODE)");
$stmt->execute();