Internal: Fix various PHP8 compatibility issues to reduce error messages

main/inc/lib/internationalization.lib.php

@@ -1207,7 +1207,7 @@ function api_htmlentities($string, $quote_style = ENT_COMPAT, $encoding = 'UTF-8
             break;
     }
 
-    return mb_convert_encoding($string, 'HTML-ENTITIES', 'UTF-8');
+    return htmlspecialchars($string);
 }
 
 /**

main/inc/lib/system/session.class.php

@@ -128,14 +128,17 @@ public function offsetExists($offset): bool
     }
 
     /**
-     * It it exists returns the value stored at the specified offset.
-     * If offset does not exists returns null. Do not trigger a warning.
+     * If it exists, returns the value stored at the specified offset.
+     * If offset does not exist, returns null. Do not trigger a warning.
      *
      * @param string $offset
      *
      * @return mixed (write offsetGet($offset): mixed on PHP 8 and & > )
      */
-    public function offsetGet($offset)
+    #if PHP_VERSION_ID >= 80000
+    #[\ReturnTypeWillChange]
+    #endif
+    public function offsetGet($offset): mixed
     {
         return self::read($offset);
     }

main/install/index.php

@@ -170,6 +170,7 @@
 $badUpdatePath = false;
 $emptyUpdatePath = true;
 $proposedUpdatePath = '';
+$updateFromConfigFile = '';
 
 if (!empty($_POST['updatePath'])) {
     $proposedUpdatePath = $_POST['updatePath'];
@@ -198,11 +199,10 @@
 } elseif (@$_POST['step1']) {
     $_POST['updatePath'] = '';
     $installType = '';
-    $updateFromConfigFile = '';
     unset($_GET['running']);
 } else {
     $installType = isset($_GET['installType']) ? $_GET['installType'] : null;
-    $updateFromConfigFile = isset($_GET['updateFromConfigFile']) ? $_GET['updateFromConfigFile'] : false;
+    $updateFromConfigFile = isset($_GET['updateFromConfigFile']) ? $_GET['updateFromConfigFile'] : '';
 }
 
 if ($installType == 'update' && in_array($my_old_version, $update_from_version_8)) {

src/Chamilo/UserBundle/Entity/User.php

@@ -458,6 +458,24 @@ public function __toString()
     {
         return $this->getUsername();
     }
+    public function __serialize(): array
+    {
+        return get_object_vars($this);
+    }
+    public function __unserialize(array $data): void
+    {
+        $reflection = new ReflectionClass($this);
+        $properties = $reflection->getProperties();
+        $propertyNames = array_map(fn($prop) => $prop->getName(), $properties);
+
+        foreach ($data as $property => $value) {
+            if (in_array($property, $propertyNames)) {
+                $this->$property = $value;
+            } else {
+                // the attribute does not exist in this version of the class
+            }
+        }
+    }
 
     /**
      * Updates the id with the user_id.