Answer by andrewsi for Error when tried to allocate bytes

The issue is with these lines:

$result = $sth->fetchAll(PDO::FETCH_ASSOC);while ($row = $result) {    $data[] = $row;}

You're assigning $result, and then using that value in your while loop. What is happening is that you're then assigning $row with the same value over and over, until you run out of memory.

To fix it, you just need to move the assignments:

while ($row = $sth->fetch(PDO::FETCH_ASSOC)) {    $data[] = $row;}

That will loop through the database, assigning each row into $data.

You can also pull back everything in one go, as your code currently does, using fetchAll

$result = $sth->fetchAll(PDO::FETCH_ASSOC);

In that case, everything is already assigned to $result, so you don't need the while loop at all. If you have a look at the man page, you can see the format that fetchAll returns you data - it might not be exactly what you're expecting.