Merge pull request #1021 from CassianoRafael/master

Title: Prevent Potential Null Issue and Warnings in rawAddPrefix (#1021)

Description:
This pull request addresses a potential issue in the rawAddPrefix method of the PHP-MySQLi-Database-Class. In newer PHP versions, accessing properties of potentially null variables can trigger warnings.

Issue:
If the provided SQL query doesn't contain keywords like "FROM," "INTO," "UPDATE," "JOIN," or "DESCRIBE" (e.g., functions and procedures), the $table array used for prefixing might be empty. This could lead to:

PHP Deprecated Warnings: Accessing properties of a potentially null $table array can cause warnings in newer PHP versions.
Unexpected Behavior: An empty $table array could result in unexpected behavior when adding prefixes.
Fix:

This pull request introduces a conditional check to ensure there are table name matches before proceeding with prefix replacement. This prevents the $table array from being null and avoids potential warnings and unexpected behavior.

Benefits:
Improves code robustness and prevents warnings in newer PHP environments.
Enhances code clarity and maintainability.

Additional Notes:
This is a valuable contribution by first-time contributor @CassianoRafael (thanks!).

Author: ThingEngineer

MysqliDb.php

@@ -556,6 +556,10 @@ public function rawAddPrefix($query){
         preg_match_all("/(from|into|update|join|describe) [\\'\\´]?([a-zA-Z0-9_-]+)[\\'\\´]?/i", $query, $matches);
         list($from_table, $from, $table) = $matches;
 
+        // Check if there are matches
+        if (empty($table[0]))
+            return $query; 
+
         return str_replace($table[0], self::$prefix.$table[0], $query);
     }