Bug-fix (phpMussel/phpMussel#242).

Changelog excerpt:
- When phpMussel encountered a sufficiently zip-like file which isn't a
  valid zip file (e.g., any non-zip file beginning with the 'PK' header)
  and consequently attempted to read that non-zip file using ZipHandler,
  ZipHandler's destructor would generate a fatal error per
  invalid/uninitialised Zip object when invoked; Fixed.

Author: Maikuolan

Changelog.md

@@ -156,4 +156,8 @@ __*Why "v3.0.0" instead of "v1.0.0?"*__ Prior to phpMussel v3, the "phpMussel Co
 
 ### v3.5.3
 
+#### Bugs fixed.
+- [2024.11.06]: When phpMussel encountered a sufficiently zip-like file which isn't a valid zip file (e.g., any non-zip file beginning with the 'PK' header) and consequently attempted to read that non-zip file using ZipHandler, ZipHandler's destructor would generate a fatal error per invalid/uninitialised Zip object when invoked; Fixed. *Refer [#242](https://github.com/phpMussel/phpMussel/issues/242).*
+
+#### Other changes.
 - [2024.11.06]: Added PHP 8.4 to workflows.

src/ZipHandler.php

@@ -8,7 +8,7 @@
  * License: GNU/GPLv2
  * @see LICENSE.txt
  *
- * This file: Zip handler (last modified: 2021.07.10).
+ * This file: Zip handler (last modified: 2024.11.06).
  */
 
 namespace phpMussel\Core;
@@ -56,7 +56,7 @@ public function __construct($Pointer)
         }
 
         $this->ZipObject = new \ZipArchive();
-        if (!$this->ZipObject->open($Pointer)) {
+        if ($this->ZipObject->open($Pointer) !== true) {
             $this->ErrorState = 2;
             return;
         }