Semi-stable version with old variable names

scripts/db/db-functions.php

@@ -130,3 +130,56 @@ function db_get_var($mysqli, $sql, $params = []) {
     $stmt->close();
     return $value;
 }
+
+function db_get_variable($mysqli, $tableVar, $params = []) {
+    if (count($params) !== 1) return null;
+    $stmt = $mysqli->prepare("SELECT `value` FROM $tableVar WHERE `name` = ?");
+    $stmt->bind_param("s", ...$params);
+    $stmt->execute();
+    $stmt->bind_result($value);
+    $stmt->fetch();
+    $stmt->close();
+    return $value;
+}
+
+function db_update_variable($mysqli, $tableVar, $params = ['name', 'value']) {
+    if (count($params) !== 2) return false;
+    $stmt = $mysqli->prepare("INSERT INTO $tableVar (`name`, `value`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `value` = VALUES(`value`)");
+    $stmt->bind_param("ss", ...$params);
+    $stmt->execute();
+    $stmt->close();
+    return true;
+}
+
+function db_check_var(mysqli $mysqli, string $table, string $where, array $params = []) : bool {
+
+    $table = preg_replace('/[^a-zA-Z0-9_]/', '', $table);
+    
+    $stmt = $mysqli->prepare("SELECT 1 FROM `" . $table . "` WHERE " . $where);
+    if (!$stmt) {
+        return false;
+    }
+
+    if (!empty($params)) {
+        $types = '';
+        foreach ($params as $param) {
+            if (is_int($param)) {
+                $types .= 'i';
+            } elseif (is_float($param)) {
+                $types .= 'd';
+            } else {
+                $types .= 's';
+            }
+        }
+        $stmt->bind_param($types, ...$params);
+    }
+
+    $stmt->execute();
+    
+    $stmt->store_result();
+    $exists = $stmt->num_rows > 0;
+    
+    $stmt->close();
+    
+    return $exists;
+}