PHP错误-“警告：从...中的空值创建默认对象” [重复]

Question

我的网站上有一个 PHP 文件，在从 PHP 5.3 升级到 PHP 5.4 后出现错误。这是它产生的错误：

警告：从空值创建默认对象（删除此 部分错误）/arcade.php 第 60 行

60后的代码是这样的：

{  
    $this->arcade->version = '';        
  }else
  {
    $this->arcade->version = '3.4.0';       
  } 

我假设它与那里的空白值有关。我研究了一些类似的修复程序，但我仍然无法确定应该添加到 php 文件中以修复它的确切内容。

非常感谢您提前提供的任何帮助！

编辑：这是其余的代码，我不确定它在哪里初始化。我对这些事情一无所知。

if ( ! defined( 'IN_IPB' ) )
{
    print "<h1>Incorrect access</h1>You cannot access this file directly. If you have recently upgraded, make sure you upgraded all the relevant files. <br /> <b>File Version 3.3.0</b>";
    exit();
}


class component_public
{
    var $ipsclass   = '';
    var $arcade     = '';

    function run_component()
    {
       $this->ipsclass->load_language( 'lang_Arcade' );



    if( !$this->ipsclass->cache['arcade_settings']['allow_user_skin'] )
     {  
        if( $this->ipsclass->cache['arcade_settings']['skin'] == 0 ) {
             $this->ipsclass->load_template('skin_Arcade1');
        } 
        if( $this->ipsclass->cache['arcade_settings']['skin'] == 1 ) {
            $this->ipsclass->load_template('skin_Arcade2');     
        }  
        if( $this->ipsclass->cache['arcade_settings']['skin'] == 2 ) {
            $this->ipsclass->load_template('skin_Arcade3');     
        } 
     }else

     if( $this->ipsclass->cache['arcade_settings']['allow_user_skin'] && !$this->ipsclass->member['id'] )
     {  
        if( $this->ipsclass->cache['arcade_settings']['skin'] == 0 ) {
             $this->ipsclass->load_template('skin_Arcade1');
        } 
        if( $this->ipsclass->cache['arcade_settings']['skin'] == 1 ) {
            $this->ipsclass->load_template('skin_Arcade2');     
        }  
        if( $this->ipsclass->cache['arcade_settings']['skin'] == 2 ) {
            $this->ipsclass->load_template('skin_Arcade3');     
        } 
     }else

    if( $this->ipsclass->cache['arcade_settings']['allow_user_skin'] && $this->ipsclass->member['id'] )
      {
        $this->ipsclass->DB->query("SELECT arcade_skin FROM ".$this->ipsclass->vars['sql_tbl_prefix']."members WHERE id=".intval($this->ipsclass->member['id']));
        $this->arcade->lib->user = $this->ipsclass->DB->fetch_row();

        if( $this->arcade->lib->user['arcade_skin'] == 0) {
             $this->ipsclass->load_template('skin_Arcade1');        
        } 
        if( $this->arcade->lib->user['arcade_skin'] == 1) {
            $this->ipsclass->load_template('skin_Arcade2');     
        }  
        if( $this->arcade->lib->user['arcade_skin'] == 2) {
            $this->ipsclass->load_template('skin_Arcade3');     
        } 
     }


     if( !$this->ipsclass->cache['arcade_settings']['build'] )  
      {  
        $this->arcade->version = '';        
      }else
      {
        $this->arcade->version = '3.4.0';       
      } 


        $this->ipsclass->vars['arcade_dir'] = 'arcade';

        $component_copyright = '<div class="copyright" align="center"><a href="http://www.ibparcade.com" style="text-decoration: none;" target="_blank">ibProArcade</a> '.$this->arcade->version.' &copy; '.date('Y').'</div>';

        $this->ipsclass->skin['_wrapper'] = str_replace("<% COPYRIGHT %>", $component_copyright . "<% COPYRIGHT %>", $this->ipsclass->skin['_wrapper']);        


        require ROOT_PATH.$this->ipsclass->vars['arcade_dir'].'/db/arcade_mysql.php';
        $this->arcade->db = new arcade_db;
        $this->arcade->db->ipsclass =& $this->ipsclass;

        require ROOT_PATH.$this->ipsclass->vars['arcade_dir'].'/modules/arcadelib.php';
        $this->arcade->lib = new arcadelib;
        $this->arcade->lib->ipsclass =& $this->ipsclass;
        $this->arcade->lib->arcade =& $this->arcade;
        $this->arcade->lib->init();

        require ROOT_PATH.$this->ipsclass->vars['arcade_dir'].'/modules/scoreboard.php';
        $this->arcade->sb = new scoreboard;
        $this->arcade->sb->ipsclass =& $this->ipsclass;
        $this->arcade->sb->arcade =& $this->arcade;

        require ROOT_PATH.$this->ipsclass->vars['arcade_dir'].'/modules/arcadeskin.php';
        $this->arcade->skin = new arcadeskin;
        $this->arcade->skin->ipsclass =& $this->ipsclass;
        $this->arcade->skin->arcade =& $this->arcade;

        require_once ROOT_PATH.'sources/api/api_topics_and_posts.php';
        $this->arcade->api = new api_topics_and_posts();
        $this->arcade->api->ipsclass =& $this->ipsclass;



        if( $this->arcade->lib->settings['arcade_status'] )
        {

            $this->arcade->lib->arcade_error( array( LEVEL => 1, MSG => 'arcade_offlinemsg' ) );

        }

        $page = (isset($this->ipsclass->input['p'])) ? $this->ipsclass->txt_alphanumerical_clean( $this->ipsclass->input['p'] ) : 'default';
        $code = (isset($this->ipsclass->input['code'])) ? $this->ipsclass->input['code'] : '';

        // Backwords compatibility with older games
        if( isset($this->ipsclass->input['do']) && ($this->ipsclass->input['do'] == 'newscore') )
        {
            $code = 'newscore';
        }

        if( isset($this->ipsclass->input['do']) && ($this->ipsclass->input['do'] == 'verifyscore') )
        {
            $code = 'verifyscore';
        }

        if( isset($this->ipsclass->input['do']) && ($this->ipsclass->input['do'] == 'savescore') )
        {
            $code = 'savescore';
        }


        $file = ROOT_PATH.$this->ipsclass->vars['arcade_dir'].'/modules/page_'.$page.'.php';
        if( file_exists($file) )
        {
            require $file;  
        }
        else
        {
            require ROOT_PATH.$this->ipsclass->vars['arcade_dir'].'/modules/page_default.php';
        }

        $runme = new arcade_page;
        $runme->ipsclass =& $this->ipsclass;
        $runme->arcade =& $this->arcade;
        $runme->exec_page( $code );
    }

}

Answer 1

如果尝试访问不存在对象的属性，则会出现该错误，如下所示：

$arcade = null;
$arcade->version = '3.4.0';

为了修复它，您的$this->arcade 属性不应为空。

更新。

首先，完全删除带有arcade定义/初始化的行：

class component_public
{
    var $ipsclass   = '';

    function run_component()
    {
       $this->ipsclass->load_language( 'lang_Arcade' );

接下来，添加这段代码：

class SilentAssasin {

    public function __get($property) {
        return $this->{$property} = new static();
    }

}

class component_public extends SilentAssasin
{

而不是这个：

class component_public
{

那必须修复 creating from empty 错误。

啊，忘了提... SilentAssasin 只是自定义类的名称，实际上您可以将其命名为任何您喜欢的名称，例如 PathosErrorSuppressor 或 OversizedBanHammerForThatStupidError 等。