mysql_fetch_array（）始终返回null

I am try to fetch data from the database

$check_sql = 'SELECT * FROM table;
$check_result = mysql_query($check_sql);
echo $check_result;
$result = mysql_fetch_array($check_result);

when I echo $check_result, it shows 'Resource id 2', which i think it means there exists a return array, but when I use mysql_fetch_array, it will return a null value, and I don't know why...
And I found that no matter whether there exists the resules or not, echo $check_result would always shows 'Resource id#2', does this sentence in mysql mean 'no results' ? Could someone help???

mysql_fetch_array() returns an array. You definitely must take a look at documentation http://php.net/mysql_fetch_array

Try print_r($result);

In case if you are dealing with multiple rows in your mysql query you need to use code like this:

while ($row = mysql_fetch_array($check_result) )
{
   echo $row['ROW_NAME_HERE'];
} 

I guess it is why you mentioned mysql_fetch_array function.