Query doesn't work on Linux?

[Mlado Miletins]

Hey guys, I'm facing a troubling situation with my Slim app. The problem is an MySQL query which works under WAMP local server, however, it doesn't work on a live Linux server. The code follows:

//$tablesAll[] is an array containing the names of several database tables that i need in my query
//some code
foreach ($tablesAll as $tableName)
{
$stmt2 = $this->db->prepare("SELECT col1, col2, col3, col4 FROM {$tableName}");
$stmt2->execute();

$data1 = [];
$data2 = [];
$data3 = [];
$data4 = [];

while ($row2 = $stmt2->fetch(PDO::FETCH_ASSOC))
{
$data1[] = $row2['col1'];
$data2[] = $row2['col2'];
$data3[] = $row2['col3'];
$data4[] = $row2['col4'];
}
}
var_dump($data1);
//some code
After investigating i discovered that $data1[] array is empty when i run this on a linux server. var_dump returns NULL. But it works normally on a WAMP server and returns filled array. Also, when i directly hardcode a table name after FROM... it works. So it appears the problem happens to be {$tableName} which somehow doesn't work on a linux server. Does it make any sense?

Thanks!