php
$p = Project::where('user_id', '=', $userid)->get(); print_r($p); //有3条数据 empty($p); //return ture
为什么print_r能看到数据,可以empty却返回true呢?
gettype是不是可以?为空返回NULL
php.net/iterator_to_array
1.
find --> 返回 object or empty
ex:
$p = Project::find($id);
if(empty($p)) {
dd('project is empty');
}
get --> 返回object , 透过count 方法判断
ex:
$p = Project::where('user_id', '=', $userid)->get();
if($p->count() == 0) {
dd('project is empty');
}