PHP mysql error when updating database

Question

I'm getting the following error

Warning: PDOStatement::execute(): SQLSTATE[HY093]: 
Invalid parameter number: number of bound variables does not match number of tokens

When I'm trying to update MySQL database.

Here is the code my using.

public function update() {
    global $db;
    $stmt = $db->prepare("UPDATE products SET Name='?', Cate_id='?', Price='?', Image='?', Special='?', Special_price='?', Disable='?' WHERE PID = ?;");
    $stmt->execute(array($this->name, $this->category, $this->price, $this->image, $this->special, $this->special_price, $this->disable, $this->id));
}

Answer 1

SET Name='?', Cate_id='?', Price='?', Image='?'  etc

does not need quotes in the ?

should be

SET Name=?, Cate_id=?, Price=?, Image=? etc...

Answer 2

Please follow the following:

$stmt = $db->prepare("UPDATE products SET Name='?', Cate_id=?, Price=?, Image=?, Special=?, Special_price=?, Disable=? WHERE PID = ?;");

$stmt->bind_param($this->name, $this->category, $this->price, $this->image, $this->special, $this->special_price, $this->disable, $this->id);

$stmt->execute();