小编use*_*420的帖子

我想删除字符串开头的空格.它应该只删除字符串开头的空格,其他空格应该在那里.

var string=' This is test';

我正在尝试使用 cakephp 中的 LEFT join 选择数据，这里我如何使用两个以上的表进行 LEFT join。这里我在两个表 news_feeds 和 news_feed_likes 之间创建 LEFT join。我想在这里介绍另外两个表，NewsFeedComments 和 newsfeed_likes_comments。我怎样才能做到这一点？

谢谢你的帮助

$this->paginate = array(
    'conditions' => array('NewsFeed.group_id'=>$groupdata['Group']['id'],'NewsFeed.status'=>'A'),
    'joins' => array(
        array(
            'alias' => 'newslikes',
            'table' => 'news_feed_likes',
            'type' => 'LEFT',
            'conditions' => array(
                'newslikes.news_feed_id = NewsFeed.id',
                'newslikes.user_id'=>$this->Auth->user('id'),
                'newslikes.status'=>'1',
            ),
        ),
        array(
            'alias' => 'newscommentslikes',
            'table' => 'news_feed_comments_likes',
            'type' => 'LEFT',
            'conditions' => array(
                'newscommentslikes.news_feed_comment_id = NewsFeedComment.id',
                'newscommentslikes.user_id'=>$this->Auth->user('id'),
                'newscommentslikes.status'=>'1',
            ),
        ),
    ),
    'fields' => array(
        'IFNULL(newslikes.user_id,0) AS likestatus', 
        'NewsFeed.id', 
        'NewsFeed.posted_message', 
        'NewsFeed.created', 
        'NewsFeed.user_id', 
        'NewsFeed.status', 
        'NewsFeed.newslike', 
        'IFNULL(newslikes.status,0) …