PHP不允许使用多个函数参数的问题

Question

is there an issue with PHP not allowing multiple function parameters and returning the correct value. Here is the code:

function getConfig($name) {
$sql = "SELECT value FROM config WHERE name = '".$name."'";
$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);
print $row["value"];
} 

getConfig("name");

While the code above works, the code bellow similar does not work. Here is the code:

function getConfig($name, $from) {
$sql = "SELECT value '".$from."' config WHERE name = '".$name."'";
$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);
print $row["value"];
} 

getConfig("name", "config");

Why does that occur that the 1st function works and the second does not?

Answer 1

$sql = "SELECT value FROM '".$from."' WHERE name = '".$name."'";
//                   FROM TABLE_NAME
//           and not TABLE_NAME TABLE_NAME