How to convert php result set to array

How to convert php result set to array: first get the object result set through "$this->db->get();"; then use "while($value = $row-> fetch_array()) {$result[]=$value;}" can be converted into an array.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

PHP queries the database, and the object result set is converted into an array

$row = $this->db->get();//得出对象结果集
$result = array();
if($row) {
    //转化为数组
   while($value = $row->fetch_array()) {
            $result[] = $value;
     }
}
print_r($result);eixt;
return $result;

$result=$mysql_query("select `id` from table_a");
$ar=array();
while($rows=$mysql_fetch_array($result))
{
   $ar[] = rows['id'];//把id存放到数组里
}

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