Generic class for SELECT in mysql leads to endless loop - php

Question

I began to write a generic class for SELECT queries that looks like this:
class DbQuery
{
private $database;
public function __construct()
{
$db_config = array(
"type" => "mysql",
"host" => "localhost",
"port" => "3306",
"charset" => "utf8",
"db" => "dbname",
"user" => "user",
"password" => "topsecret"
);
$this->database = DatabaseFactory::getFactory()->getConnection($db_config);
}
public function Select($keys = array("*"), $table, $whereClauseArray = null, $orderValues = null, $orderDirection = null, $limitIndex = null, $limitLength = null)
{
$statement = "SELECT " . implode(',', $keys) . " FROM " . $table;
if (!empty($whereClauseArray)) {
$whereClauseString = " WHERE ";
$i = 0;
foreach ($whereClauseArray as $whereClause) {
if ($i > 0) {
$whereClauseString .= " " . $whereClause['link'] . " ";
}
$whereClauseString .= $whereClause['key'] . " " . $whereClause['operand'] . " :" . $whereClause['key'] . "_" . $i;
$i++;
}
$statement .= $whereClauseString;
}
if (!empty($orderValues)) {
$orderClause = " ORDER BY ";
foreach ($orderValues as $order) {
$orderClause .= $order . ", ";
}
$orderClause = substr($orderClause, 0, -2);
$statement .= $orderClause . " " . $orderDirection;
}
if ($limitIndex != null && $limitLength != null) {
$statement .= " LIMIT " . $limitIndex . "," . $limitLength;
}
$query = $this->database->prepare($statement . ";");
$file = $_SERVER["DOCUMENT_ROOT"] . '/../db.log';
$current = file_get_contents($file);
$current .= date("Y-m-d H:i:s", time()) . " => ";
$current .= "Statement: " . $statement . "\n";
file_put_contents($file, $current);
$j = 0;
foreach ($whereClauseArray as $whereClause) {
$keystring = ":" . $whereClause['key'] . "_" . $j;
$bindValue = trim(strip_tags($whereClause['value']));
$query->bindValue($keystring, $bindValue);
$file = $_SERVER["DOCUMENT_ROOT"] . '/../db.log';
$current = file_get_contents($file);
$current .= date("Y-m-d H:i:s", time()) . " => ";
$current .= "BindValue: " . $keystring . " -> " . trim(strip_tags($whereClause['value'])) . "\n";
file_put_contents($file, $current);
$j++;
}
// $query->execute();
if ($keys === "count(*)") {
return $query->fetchColumn(0);
} else {
return $query->fetchAll();
}
}
}
I call the function like that:
$obj_artikel_startseite = new DbQuery();
$obj_artikel_startseite->Select(array("*"), "psartikel", array(array("link" => "AND", "key" => "status", "value" => "freigeschaltet", "operand" => "="), array("link" => "OR", "key" => "status", "value" => "reserviert", "operand" => "=")), array("id"), "DESC", 0, 3)) {
As long as I leave the execution commented, I get a proper output in my db.log file:
2022-10-23 19:35:51 => Statement: SELECT * FROM psartikel WHERE status = :status_0 OR status = :status_1 ORDER BY id DESC
2022-10-23 19:35:51 => BindValue: :status_0 -> freigeschaltet
2022-10-23 19:35:51 => BindValue: :status_1 -> reserviert
But when I try to execute the prepared statement with binded values, it leads to an endless loop. I don´t understand why.
Regards
Edit: Endless loop means the execution limit exceeds and the output in my log is about thousands, indentical entries...