尝试在json编码期间获取非对象错误的属性

Question

Here is a piece of code i am trying to write. Here i want to retrieve data from the database, store that into an array and then json_ecode it and set is as output. But i keep on getting this error "Trying to get property of non-object".

Here is the code

$data['query'] = $this->db->get('forms');

foreach($data['query'] as $row)
{
    $forms_array[] = array(
        $row->id 
    );
}   

$return=json_encode($forms_array);
$this->output->set_output($return); 

Answer 1

You should first check that your query is actually returning rows. Secondly, you want to access $data['query']->result() in your foreach :

if($data['query']->num_rows() > 0){
    // The query returned rows...
    foreach($data['query']->result() as $row){
        $forms_array[] = array(
            $row->id 
        );
    } 
}

Answer 2

您应该在foreach之外声明$ forms_array []。