在PHP中将对象转换为字符串

Question

我尝试了几种不同的方法，在函数get_dollars中将$ dollar从object转换为string，但没有成功。这就是var_dump所说的：

dollars: object(stdClass)#4 (1) {
  ["dollars"]=>
  string(2) "10"
}
UnityEngine.Debug:Log(Object)
<GetDollars>c__Iterator2C:MoveNext() (at Assets/MultiOnline/UMA/Example/Scripts/UMACharacterCustomization.cs:249)

这是代码：

UMACharacterCustomization.class.php

 <?php
//MOPlayer: manage all interactions with the player_name MySQL table
Class UMACharacterCustomization extends MODb{
    //character name
    private $name;
    private $errorMessage=null;
    private $dollarMessage;
    private $euroMessage=null;
        private $dollars=null;
        private $euros=null;

    // Constructor
    function __construct($user, $pass, $host, $dbName){
        parent::__construct($user, $pass, $host, $dbName);
    }

    // Destructor
    function __destruct(){
        parent::__destruct();
    }

    // Getter
    public function __get($nom){
        if(isset($this->$nom)){
            return $this->$nom;
        }
    }

    //Save the player_name
    public function playername($name,$user_name){
        if(!empty($name)&&!empty($user_name)){
            $this->name->$name;
            $this->user_name->$user_name;
            $array = array(
                        ':player_id' => '',
                        ':player_name' => secure_prepare_db($name),
                        ':userName' => secure_prepare_db($user_name)
                    );
        //  $array=array(':player_id' => '',
//':player_name' => secure_prepare_db($this->$name));

            $this->prepare_exec('INSERT INTO players(player_id,player_name,userName) VALUES(:player_id,:player_name,:userName)', $array);
        }else{
$this->errorMessage.= $name;
}
        return false;
    }


public function get_dollars($user_name){
        if(!empty($user_name)){
$this->user_name->$user_name;
            $array=array(':userName' => secure_prepare_db($user_name));

$dollars = $this->query_fetchObject('SELECT dollars FROM
                    players WHERE userName=\''.$user_name.'\'');

$this->dollarMessage.= (string)$dollars ; 

        }else{
$this->errorMessage.= $user_name;
}
    }

    public function get_euros($user_name){
        if(!empty($user_name)){
$this->user_name->$user_name;
            $array=array(':userName' => secure_prepare_db($user_name));

$euros = $this->query_fetchObject('SELECT euros FROM
                    players WHERE userName=\''.secure_db($user_name).'\'');


$this->euroMessage.= ''+ $euros ; 

        }else{
$this->errorMessage.= $user_name;
}
    }
}
?>  

非常感谢您的帮助