如何从代码点火器中的选择查询中回显值

尝试：

$row = $id->row();
echo $row->id;

要从选择查询中回显id，请使用->row()

$query = $this->db->query("SELECT id from tbl_profile_main WHERE token_='".$token."'"); 
$id = $query->row();
echo $id->id;// will echo only id one time

读取https://www.codeigniter.com/user_guide/database/results.html

$query = $this->db->select('id')->where(array('token_'=>$token))->get('tbl_profile_main');
if($query->num_rows()>0{

//if multiple rows
 $result = $query->result_array();
  foreach($result as $id){
    echo $id['id'];
  }
   //if one row
    //  $id = $query->row();
   // echo $id->id;

}

尝试

$query = $this->db->query("SELECT id from tbl_profile_main WHERE token_='".$token."';");
$row = $query->row();
if (isset($row))
{
   echo $row->id;        
}

对于倍数结果

$query = $this->db->query("SELECT id from tbl_profile_main WHERE token_='".$token."';");
foreach ($query->result() as $row)
{
   echo $row->id; // Echo id of all result and retun as object         
}

如果一行：

$id = $id->row_array()['id'];

如果有多行：

foreach($id->result_array() as $ids) {
  print $ids['id']; // or save to an array or whatever you please
}