Using PHP variable in mysql_query string - php

Question

OK guys. I have a somewhat complicated issue with passing PHP variables into the mysql_query string.
The $_GET['date']; when passed will contain something like: 2015_01_07_1
I need to have the GET data passed into the table names using the $week variables.
<?php
$week= $_GET['date'];
$con=mysqli_connect("localhost","root","mypassword","beerhandpoker");
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$result = mysqli_query
($con,
"SELECT games_brixx_gastonia_'$week'.rank, players_brixx_gastonia.name, games_brixx_gastonia_'$week'.points
FROM games_brixx_gastonia_'$week', players_brixx_gastonia
WHERE games_brixx_gastonia_'$week'.email = players.email
ORDER BY games_brixx_gastonia_'$week'.rank
LIMIT 20"
);
echo "<table>
<tr>
<th>Rank</th>
<th>Name</th>
<th>Points</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
echo "<tr>";
echo "<td>" . $row['rank'] . "</td>";
echo "<td>" . $row['name'] . "</td>";
echo "<td>" . $row['points'] . "</td>";
echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>

Answer 1

Change the string literal to:
"SELECT games_brixx_gastonia_$week.rank,
players_brixx_gastonia.name,games_brixx_gastonia_$week.points
FROM games_brixx_gastonia_$week, players_brixx_gastonia
WHERE games_brixx_gastonia_$week.email = players_brixx_gastonia.email
ORDER BY games_brixx_gastonia_$week.rank
LIMIT 20"
You have to remove the ' characters;
It's going to the db as games_brixx_gastonia_'2015_01_07_1'.rank

Answer 2

Why do you put single quotes? It should work:
SELECT games_brixx_gastonia_{$week}.rank, players_brixx_gastonia.name, games_brixx_gastonia_{$week}.points
FROM games_brixx_gastonia_{$week}, players_brixx_gastonia
WHERE games_brixx_gastonia_{$week}.email = players.email
ORDER BY games_brixx_gastonia_{$week}.rank
LIMIT 20
Anyway, I'd rather advice you to use statement instead. Check it out:
http://php.net/manual/pt_BR/mysqli.prepare.php

Answer 3

Just remove the ' characters. Otherwise the query would try to get data from the table games_brixx_gastonia_'2015_01_07_1' and not games_brixx_gastonia_2015_01_07_1.