Why does the MySQL client return a result, and PHP can't get it?

Why does the MySQL client return a result, and PHP can't get it?
RT, I execute the SQL statement above the MySQL client command line:
Select COUNT (*) as amount from main where id = 2;
Results can be obtained
+--------+
| Amount |
+--------+
| 1 |
+--------+
But inside the PHP program,
$sql 1= "SELECT COUNT (*) as amount from main where id = 2";
$reqult = mysql_query ($sql 1);
echo $sql 1;
$row = Mysql_fetch_row ($reqult);
$amount = $row [0];
The $SQL1 here is always empty!
And I changed $SQL1 to select COUNT (*) as amount from main; This sentence can be taken to the normal value,
Please hero to help younger brother to see ha this is a question!
I've been knocked out by this little problem!
Thanks a lot! MySQL PHP SQL Query

------Solution--------------------
Var_dump ($row); What's the result?

