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libraries/vendor/symfony/validator/Constraints/ExpressionLanguageProvider.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+use Symfony\Component\ExpressionLanguage\ExpressionFunctionProviderInterface;
+
+class ExpressionLanguageProvider implements ExpressionFunctionProviderInterface
+{
+    public function getFunctions(): array
+    {
+        return [
+            new ExpressionFunction('is_valid', function (...$arguments) {
+                return sprintf(
+                    '0 === $context->getValidator()->inContext($context)->validate(%s)->getViolations()->count()',
+                    implode(', ', $arguments)
+                );
+            }, function (array $variables, ...$arguments): bool {
+                return 0 === $variables['context']->getValidator()->inContext($variables['context'])->validate(...$arguments)->getViolations()->count();
+            }),
+        ];
+    }
+}