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函数代码详细求解解决办法

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2016-06-13 11:27:50967browse

函数代码详细求解
请高手帮忙详细解释下段代码
public function fetch_all_by_sql($where, $order = '', $start = 0, $limit = 0, $count = 0, $alias = '') 
{
$where = $where && !is_array($where) ? " WHERE $where" : '';
if(is_array($order)) {
$order = '';
}
if($count) {
return DB::result_first('SELECT count(*) FROM '.DB::table($this->_table).'  %i %i %i '.DB::limit($start, $limit), array($alias, $where, $order));
}
return DB::fetch_all('SELECT * FROM '.DB::table($this->_table).' %i %i %i '.DB::limit($start, $limit), array($alias, $where, $order));
}

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