php – 在null上调用成员函数

抱歉,如果这是真正的基础,但当
PHP进入功能时,我已经超过了我的头脑.

我有一个论坛的插件,它加载一个flash cookie作为检测重复帐户的方法.

该脚本在大约0.1%的页面视图上失败,从而导致WSOD.错误指向此行:

return $this->registry->output->getTemplate( 'dml' )->duplicatesLoadMovie( $host, $path, $id, $md5 );

而错误是:

Fatal error: Call to a member function duplicatesLoadMovie() on null in /var/www/…/web/forums/hooks/duplicatesLoadMovie.php on line 75

对我来说,这是$host,$path,$id或$md5中的一个返回null,但由于这不是我的脚本(编码器当然没有响应),我想解决这个问题.最简单的方法(除了删除它,这是后备位置).

如果id.null,我可以简单地做一些$id = 0的效果吗? (对不起Rubyspeak)每个$变量?

该文件的完整来源:

class duplicatesLoadMovie
{ 
/**
 * Registry object shortcuts
 *
 * @var     $registry
 * @var     $settings
 * @var     $member
 * @var     $memberData
 **/
public $registry;
public $settings;
public $member;
public $memberData;

/**
 * Main function executed automatically by the controller
 *
 * @access  public
 * @return  @e void
 **/
public function __construct()
{
    $this->registry   = ipsRegistry::instance();
    $this->settings   =& $this->registry->fetchSettings();
    $this->member     = $this->registry->member();
    $this->memberData =& $this->registry->member()->fetchMemberData();
}

/**
 * Get the output
 *
 * @access  public
 * @return  @e string
 **/
public function getOutput()
{
    /* Grab host URL and installation path of the community */
    $host = $this->settings['board_url'];

    $parsed = parse_url( $host );
    $path = trim( $parsed['path'], '/' );
    if( $path == '' )
    {
        $path = '/';
    }

    $host = 'host=' . $host;
    $path = 'path=' . $path;

    /* Determine the appropriate identification method (member_id for members and session_id for guests) */
    if( $this->memberData['member_id'] )
    {
        $id = 'mid=' . $this->memberData['member_id'];
    }
    else
    {
        $id = 'sid=' . $this->member->session_id;
    }

    /* Grab the secure key for AJAX */
    $md5 = 'md5=' . $this->member->form_hash;

    /* Finally, call the template bit */
    return $this->registry->output->getTemplate( 'dml' )->duplicatesLoadMovie( $host, $path, $id, $md5 );
}

最佳答案 我怀疑这个getTemplate(‘dml’)没有返回值.如果你做一个var_dump(getTemplate(‘dml’)),它会显示什么吗?

您可以在执行该行代码之前检查“null”,并在“else”语句中输出错误消息或其他适合该错误的操作.

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