Finally fix often reported enum issue in rule engine

app/Http/Controllers/HomeController.php

@@ -122,6 +122,7 @@ final class HomeController extends Controller
      */
     public function index(AccountRepositoryInterface $repository): mixed
     {
+
         $types = config('firefly.accountTypesByIdentifier.asset');
         $count = $repository->count($types);
         Log::channel('audit')->info('User visits homepage.');

app/Providers/FireflyServiceProvider.php

@@ -70,6 +70,7 @@ use FireflyIII\Support\Form\RuleForm;
 use FireflyIII\Support\Navigation;
 use FireflyIII\Support\Preferences;
 use FireflyIII\Support\Steam;
+use FireflyIII\TransactionRules\Engine\CustomExpressionLanguage;
 use FireflyIII\TransactionRules\Engine\RuleEngineInterface;
 use FireflyIII\TransactionRules\Engine\SearchRuleEngine;
 use FireflyIII\TransactionRules\Expressions\ActionExpressionLanguageProvider;
@@ -161,7 +162,7 @@ class FireflyServiceProvider extends ServiceProvider
 
         // rule expression language
         $this->app->singleton(static function (): ExpressionLanguage {
-            $expressionLanguage = new ExpressionLanguage();
+            $expressionLanguage = new CustomExpressionLanguage();
             $expressionLanguage->registerProvider(new ActionExpressionLanguageProvider());
 
             return $expressionLanguage;

app/TransactionRules/Engine/CustomExpressionLanguage.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace FireflyIII\TransactionRules\Engine;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+
+class CustomExpressionLanguage extends ExpressionLanguage
+{
+    protected function registerFunctions(): void
+    {
+        $basicPhpFunctions = ['min', 'max','substr','strlen','strpos'];
+        foreach ($basicPhpFunctions as $function) {
+            $this->addFunction(ExpressionFunction::fromPhp($function));
+        }
+    }
+}

app/TransactionRules/Expressions/ActionExpressionLanguageProvider.php

@@ -45,10 +45,6 @@ class ActionExpressionLanguageProvider implements ExpressionFunctionProviderInte
         return [
             new ExpressionFunction('constant2', static fn ($str): string => sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str.'!'), $function),
             new ExpressionFunction('constant', static fn ($str): string => sprintf('(is_string(%1$s) ? strtolower(%1$s) : %1$s)', $str.'!'), $function),
-
-            ExpressionFunction::fromPhp('substr'),
-            ExpressionFunction::fromPhp('strlen'),
-            ExpressionFunction::fromPhp('strpos'),
         ];
     }
 }