Fix the value param of SimpleXMLElement::addAttribute()

Closes GH-7811

Author: kocsismate

ext/simplexml/simplexml.stub.php

@@ -44,7 +44,7 @@ public function __construct(string $data, int $options = 0, bool $dataIsURL = fa
     public function addChild(string $qualifiedName, ?string $value = null, ?string $namespace = null): ?SimpleXMLElement {}
 
     /** @tentative-return-type */
-    public function addAttribute(string $qualifiedName, ?string $value = null, ?string $namespace = null): void {}
+    public function addAttribute(string $qualifiedName, string $value, ?string $namespace = null): void {}
 
     /** @tentative-return-type */
     public function getName(): string {}

ext/simplexml/simplexml_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 46da4d24787a5f975eebeaab3872eb29273a9625 */
+ * Stub hash: 06c88dc2fb5582a6d21c11aee6ac0a0538e70cbc */
 
 ZEND_BEGIN_ARG_WITH_RETURN_OBJ_TYPE_MASK_EX(arginfo_simplexml_load_file, 0, 1, SimpleXMLElement, MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO(0, filename, IS_STRING, 0)
@@ -67,9 +67,9 @@ ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_OBJ_INFO_EX(arginfo_class_SimpleXMLElement_
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, namespace, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()
 
-ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_TYPE_INFO_EX(arginfo_class_SimpleXMLElement_addAttribute, 0, 1, IS_VOID, 0)
+ZEND_BEGIN_ARG_WITH_TENTATIVE_RETURN_TYPE_INFO_EX(arginfo_class_SimpleXMLElement_addAttribute, 0, 2, IS_VOID, 0)
 	ZEND_ARG_TYPE_INFO(0, qualifiedName, IS_STRING, 0)
-	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, value, IS_STRING, 1, "null")
+	ZEND_ARG_TYPE_INFO(0, value, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, namespace, IS_STRING, 1, "null")
 ZEND_END_ARG_INFO()