[PHP Compatibility]Fix: Add PHP 8.0+ compatibility for installer superglobal access

Add null coalescing operators (??) to all array access in installer

Fix _install/constants.php - 7 key accesses

Fix _install/data/configs/constants.php - 7 key accesses

Fix _install/library/Language.class.php - HTTP_ACCEPT_LANGUAGE access

Fix WebsiteChecker.php - PHP_SELF access

Prevents 'Undefined array key' warnings in PHP 8.0+

Ensures installer works correctly on PHP 8.0-8.5

All installer files now fully compatible with PHP 8.0+.

Author: pH-7

WebsiteChecker.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * @author         Pierre-Henry Soria <hello@ph7builder.com>
- * @copyright      (c) 2018-2023, Pierre-Henry Soria. All Rights Reserved.
+ * @copyright      (c) 2018-2026, Pierre-Henry Soria. All Rights Reserved.
  * @license        See LICENSE.md and COPYRIGHT.md in the root directory.
  * @link           https://ph7builder.com
  * @package        PH7 / ROOT
@@ -55,7 +55,7 @@ public function clearBrowserCache(): void
     public function moveToInstaller(): void
     {
         // Remove backslashes for Windows compatibility
-        $sUrlPath = str_replace('\\', '', dirname(htmlspecialchars($_SERVER['PHP_SELF'], ENT_QUOTES)));
+        $sUrlPath = str_replace('\\', '', dirname(htmlspecialchars($_SERVER['PHP_SELF'] ?? '', ENT_QUOTES)));
         $sUrlPath = substr($sUrlPath, -1) !== '/' ? $sUrlPath . '/' : $sUrlPath;
 
         header('Location: ' . $sUrlPath . self::INSTALL_FOLDER_NAME);

_install/constants.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * @author           Pierre-Henry Soria <hello@ph7builder.com>
- * @copyright        (c) 2012-2023, Pierre-Henry Soria. All Rights Reserved.
+ * @copyright        (c) 2012-2026, Pierre-Henry Soria. All Rights Reserved.
  * @license          MIT License; See LICENSE.md and COPYRIGHT.md in the root directory.
  */
 
@@ -16,15 +16,15 @@
     (!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) === 'on') ||
     (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') ||
     (!empty($_SERVER['REQUEST_SCHEME']) && $_SERVER['REQUEST_SCHEME'] === 'https') ||
-    $_SERVER['SERVER_PORT'] === '443'
+    ($_SERVER['SERVER_PORT'] ?? '') === '443'
 ) ? 'https://' : 'http://';
 
 // Determine the domain name, with the port if necessary
-$sServerName = $_SERVER['SERVER_NAME'] !== $_SERVER['HTTP_HOST'] ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
-$sDomain = ($_SERVER['SERVER_PORT'] !== '80' && $_SERVER['SERVER_PORT'] !== '443' && strpos($sServerName, ':') === false) ? $sServerName . ':' . $_SERVER['SERVER_PORT'] : $sServerName;
+$sServerName = ($_SERVER['SERVER_NAME'] ?? '') !== ($_SERVER['HTTP_HOST'] ?? '') ? ($_SERVER['HTTP_HOST'] ?? '') : ($_SERVER['SERVER_NAME'] ?? '');
+$sDomain = (($_SERVER['SERVER_PORT'] ?? '') !== '80' && ($_SERVER['SERVER_PORT'] ?? '') !== '443' && strpos($sServerName, ':') === false) ? $sServerName . ':' . ($_SERVER['SERVER_PORT'] ?? '') : $sServerName;
 
 // Determine the current file of the application
-$sPhp_self = str_replace('\\', '', dirname(htmlspecialchars($_SERVER['PHP_SELF'], ENT_QUOTES))); // Remove backslashes for Windows compatibility
+$sPhp_self = str_replace('\\', '', dirname(htmlspecialchars($_SERVER['PHP_SELF'] ?? '', ENT_QUOTES))); // Remove backslashes for Windows compatibility
 
 //---------- Constants ----------//
 

_install/data/configs/constants.php

@@ -1,7 +1,7 @@
 <?php
 /**
  * @author           Pierre-Henry Soria <hello@ph7builder.com>
- * @copyright        (c) 2012-2023, Pierre-Henry Soria. All Rights Reserved.
+ * @copyright        (c) 2012-2026, Pierre-Henry Soria. All Rights Reserved.
  * @license          MIT License; See LICENSE.md and COPYRIGHT.md in the root directory.
  * @link             https://ph7builder.com
  * @package          PH7
@@ -19,19 +19,19 @@
     (!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) === 'on') ||
     (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') ||
     (!empty($_SERVER['REQUEST_SCHEME']) && $_SERVER['REQUEST_SCHEME'] === 'https') ||
-    $_SERVER['SERVER_PORT'] === '443'
+    ($_SERVER['SERVER_PORT'] ?? '') === '443'
 ) ? 'https://' : 'http://';
 
 // Determine the domain name, with the port if necessary
-$sServerName = $_SERVER['SERVER_NAME'] !== $_SERVER['HTTP_HOST'] ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
-$sDomain = ($_SERVER['SERVER_PORT'] !== '80' && $_SERVER['SERVER_PORT'] !== '443' && strpos($sServerName, ':') === false) ? $sServerName . ':' . $_SERVER['SERVER_PORT'] : $sServerName;
+$sServerName = ($_SERVER['SERVER_NAME'] ?? '') !== ($_SERVER['HTTP_HOST'] ?? '') ? ($_SERVER['HTTP_HOST'] ?? '') : ($_SERVER['SERVER_NAME'] ?? '');
+$sDomain = (($_SERVER['SERVER_PORT'] ?? '') !== '80' && ($_SERVER['SERVER_PORT'] ?? '') !== '443' && strpos($sServerName, ':') === false) ? $sServerName . ':' . ($_SERVER['SERVER_PORT'] ?? '') : $sServerName;
 
 // Get the domain that the cookie and cookie session is available (Set-Cookie: domain=your_site_name.com)
-// $sDomain_cookie = (substr($_SERVER['HTTP_HOST'], 0, 4) === 'www.') ? '.' . substr($_SERVER['HTTP_HOST'], 4) : '.' . $_SERVER['HTTP_HOST'];
+// $sDomain_cookie = (substr($_SERVER['HTTP_HOST'] ?? '', 0, 4) === 'www.') ? '.' . substr($_SERVER['HTTP_HOST'] ?? '', 4) : '.' . ($_SERVER['HTTP_HOST'] ?? '');
 $sDomain_cookie = '.' . str_replace('www.', '', $sDomain);
 
 // Determine the current file of the application
-$sPhp_self = str_replace('\\', '', dirname(htmlspecialchars($_SERVER['PHP_SELF'], ENT_QUOTES))); // Remove backslashes for Windows compatibility
+$sPhp_self = str_replace('\\', '', dirname(htmlspecialchars($_SERVER['PHP_SELF'] ?? '', ENT_QUOTES))); // Remove backslashes for Windows compatibility
 
 
 ########## CONSTANTS ##########

_install/library/Language.class.php

@@ -3,7 +3,7 @@
  * @title            Language Class
  *
  * @author           Pierre-Henry Soria <ph7software@gmail.com>
- * @copyright        (c) 2012-2019, Pierre-Henry Soria. All Rights Reserved.
+ * @copyright        (c) 2012-2026, Pierre-Henry Soria. All Rights Reserved.
  * @license          MIT License; See LICENSE.md and COPYRIGHT.md in the root directory.
  * @package          PH7 / Install / Library
  */
@@ -49,7 +49,7 @@ public function getBrowser(): ?string
             return null;
         }
 
-        $sLang = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE'])[0];
+        $sLang = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE'] ?? '')[0];
 
         return htmlspecialchars(
             strtolower(