fix syntax errors on PHP 7

Author: xabbuh

Form/DoctrineOrmTypeGuesser.php

@@ -200,7 +200,12 @@ private static function getRealClass(string $class): string
         return substr($class, $pos + Proxy::MARKER_LENGTH + 2);
     }
 
-    private static function getMappingValue(array|JoinColumnMapping $mapping, string $key): mixed
+    /**
+     * @param array|JoinColumnMapping $mapping
+     *
+     * @return mixed
+     */
+    private static function getMappingValue($mapping, string $key)
     {
         if ($mapping instanceof JoinColumnMapping) {
             return $mapping->$key;

PropertyInfo/DoctrineExtractor.php

@@ -306,7 +306,12 @@ private function getPhpType(string $doctrineType): ?string
         return null;
     }
 
-    private static function getMappingValue(array|AssociationMapping|EmbeddedClassMapping|FieldMapping|JoinColumnMapping $mapping, string $key): mixed
+    /**
+     * @param array|AssociationMapping|EmbeddedClassMapping|FieldMapping|JoinColumnMapping $mapping
+     *
+     * @return mixed
+     */
+    private static function getMappingValue($mapping, string $key)
     {
         if ($mapping instanceof AssociationMapping || $mapping instanceof EmbeddedClassMapping || $mapping instanceof FieldMapping || $mapping instanceof JoinColumnMapping) {
             return $mapping->$key;

Validator/DoctrineLoader.php

@@ -140,7 +140,12 @@ private function getExistingUniqueFields(ClassMetadata $metadata): array
         return $fields;
     }
 
-    private static function getFieldMappingValue(array|FieldMapping $mapping, string $key): mixed
+    /**
+     * @param array|FieldMapping $mapping
+     *
+     * @return mixed
+     */
+    private static function getFieldMappingValue($mapping, string $key)
     {
         if ($mapping instanceof FieldMapping) {
             return $mapping->$key;