PHP query output of SQP - php

Question

I have no actual php errors, but When I make my query this I get output :
$sql_result = "SELECT AuthorFirst, AuthorLast, OnHand, Title
FROM Inventory i, Wrote w, Author a, Book b
WHERE i.BookCode = b.BookCode AND i.BookCode = w.BookCode
AND a.AuthorNum = w.AuthorNum AND 2 = i.BranchNum";
When I change the 2 to a variable in the last line I get no output. Here is my full code:
<?php
$sql_branch = "SELECT BranchNum
FROM Branch
WHERE BranchName = '$_POST[branch]'";
$sql_result = "SELECT AuthorFirst, AuthorLast, OnHand, Title
FROM Inventory i, Wrote w, Author a, Book b
WHERE i.BookCode = b.BookCode AND i.BookCode = w.BookCode
AND a.AuthorNum = w.AuthorNum AND '$branch[BranchNum]' = i.BranchNum";
$connect = mysql_connect('students', 'xxxxx', 'xxxxx') or exit(mysql_error());
mysql_select_db('henrybooks', $connect);
if($branch_result = mysql_query($sql_branch, $connect)) {
$branch = mysql_fetch_array($branch_result);
}
else {
echo mysql_error();
}
if(mysql_query($sql_result, $connect)) {
$result = mysql_query($sql_result, $connect);
}
else {
echo mysql_error();
}
echo $branch[BranchNum];
echo "<table>
<tr>
<td>Author</td>
<td>Title</td>
<td>Number Available</td>
</tr>";
while( $row = mysql_fetch_array($result)) {
echo "<tr>";
echo "<td>".$row['AuthorFirst'].$row['AuthorLast']."</td>";
echo "<td>".$row['Title']."</td>";
echo "<td>".$row['OnHand']."</td>";
echo "</tr>";
}
echo "</table>";
?>
I feel like I don't fully understand the mysql_fetch_array() function and I'm doing something wrong as far as the variable name, but I'm unsure.
Thanks!
when I echo $sql_result it displays as such:
SELECT AuthorFirst, AuthorLast, OnHand, Title
FROM Inventory i, Wrote w, Author a, Book b
WHERE i.BookCode = b.BookCode AND i.BookCode = w.BookCode AND a.AuthorNum = w.AuthorNum AND '' = i.BranchNum
For some reason the variable is void here... but when I echo the variable itself it has a value.

Answer 1

Looking at the code, it looks $sql_result is being set before $branch. Try defining $sql_result after executing the mysql_fetch_array($branch_result). Move it to the same location where you have the "echo $branch[BranchNum];" line and see what happens.