我在这个php PDO上做错了什么

Question

So when I run this below it outputs an error Catchable fatal error: Object of class eg could not be converted to string

spl_autoload_register(function($class) {
    require_once '../dbfolder/'.$class.'.php';  
});

$mysql = dbWrapper::getDbInstance();

class eg 
{
    private $username = 'paul';
    private $email = 'paul@yahoo.com';

    public function eg_()
    {
        global $mysql;  

        $sql = "INSERT INTO users(username,email)VALUES(:username,:email)";
        $prepared = $mysql->$this->handler->prepare($sql);

        $prepared->bindParam(':username',$this->username);
        $prepared->bindParam(':email',$this->email);
        $prepared->execute();
    }
}

$eg = new eg();
$eg->eg_();

Please can anyone just point out for me what am doing wrong?

Answer 1

This line is the problem:

$prepared = $mysql->$this->handler->prepare($sql);

PHP thinks you're trying to use it's variable variable feature. It sees $mysql->$this and tries to convert $this into a string, which the current class does not support (no __toString() magic method). I assume this is a typo/copy-paste error.

To fix it, all you need is to remove it (assuming your $mysql object has a property of handler that is):

$prepared = $mysql->handler->prepare($sql);