muteUndefinedOrNullWarnings() now also mutes PHP8 warnings for undefined properties (#891)

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- `$smarty->muteUndefinedOrNullWarnings()` now also mutes PHP8 warnings for undefined properties
+
 ## [4.3.1] - 2023-03-28
 
 ### Security

libs/sysplugins/smarty_internal_errorhandler.php

@@ -17,6 +17,12 @@ class Smarty_Internal_ErrorHandler
      */
     public $allowUndefinedVars = true;
 
+    /**
+     * Allows {$foo->propName} where propName is undefined.
+     * @var bool
+     */
+    public $allowUndefinedProperties = true;
+
     /**
      * Allows {$foo.bar} where bar is unset and {$foo.bar1.bar2} where either bar1 or bar2 is unset.
      * @var bool
@@ -80,6 +86,13 @@ class Smarty_Internal_ErrorHandler
             return; // suppresses this error
         }
 
+        if ($this->allowUndefinedProperties && preg_match(
+                '/^(Undefined property)/',
+                $errstr
+            )) {
+            return; // suppresses this error
+        }
+
         if ($this->allowUndefinedArrayKeys && preg_match(
             '/^(Undefined index|Undefined array key|Trying to access array offset on value of type)/',
             $errstr