public function findField($field=null, $options=null)
    {
        if ($field) {
            $this->select($field);
        }
        $ret = $this->find($options);
        
        return $ret ? array_values($ret)[0] : null;
    }
public function findField($field=null, $options=null)
    {
        if ($field) {
            $this->select($field);
        }
        $ret = $this->find($options);
        
        return $ret ? array_values($ret)[0] : null;
    }
public function findField ( $ field = null , $ options = null ) { if ( $ field ) { $ this -> select ( $ field ) ; } $ ret = $ this -> find ( $ options ) ; return $ ret ? array_values ( $ ret ) [ 0 ] : null ; }
find one field of one record
@param  string $field string|array
@param  mixed  $options  auto guess where clause
@return mixed
find one field of one record