diff --git a/NEWS b/NEWS
index e498fac1d82ef..48e71a0a80632 100644
--- a/NEWS
+++ b/NEWS
@@ -169,6 +169,8 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed crypt() tests on musl when using --with-external-libcrypt
     (Michael Orlitzky).
+  . Fixed bug GH-18062 (is_callable(func(...), callable_name: $name) for first
+    class callables returns wrong name). (timwolla)
 
 - Streams:
   . Fixed bug GH-16889 (stream_select() timeout useless for pipes on Windows).
diff --git a/UPGRADING.INTERNALS b/UPGRADING.INTERNALS
index b963ead5cc8da..d2ab4e13fc52c 100644
--- a/UPGRADING.INTERNALS
+++ b/UPGRADING.INTERNALS
@@ -19,6 +19,8 @@ PHP 8.5 INTERNALS UPGRADE NOTES
     a value to a non-reference zval.
   . Added zval_ptr_safe_dtor() to safely destroy a zval when a destructor
     could interfere.
+  . zend_get_callable_name() now returns the name of the underlying function
+    for fake closures.
 
 ========================
 2. Build system changes
diff --git a/Zend/tests/first_class_callable/gh18062.phpt b/Zend/tests/first_class_callable/gh18062.phpt
new file mode 100644
index 0000000000000..3865dd77adba8
--- /dev/null
+++ b/Zend/tests/first_class_callable/gh18062.phpt
@@ -0,0 +1,32 @@
+--TEST--
+First Class Callable returns correct name from is_callable()
+--FILE--
+<?php
+
+class Foo {
+	public function __invoke() {
+
+	}
+
+	public static function bar() { 
+
+	}
+}
+
+function some_func() {
+
+}
+
+is_callable(some_func(...), callable_name: $name);
+var_dump($name);
+
+is_callable((new Foo())(...), callable_name: $name);
+var_dump($name);
+
+is_callable(Foo::bar(...), callable_name: $name);
+var_dump($name);
+?>
+--EXPECT--
+string(9) "some_func"
+string(13) "Foo::__invoke"
+string(8) "Foo::bar"
diff --git a/Zend/zend_API.c b/Zend/zend_API.c
index 162f9aced147b..2be3d428270f2 100644
--- a/Zend/zend_API.c
+++ b/Zend/zend_API.c
@@ -4134,6 +4134,19 @@ ZEND_API zend_string *zend_get_callable_name_ex(zval *callable, zend_object *obj
 		case IS_OBJECT:
 		{
 			zend_class_entry *ce = Z_OBJCE_P(callable);
+
+			if (ce == zend_ce_closure) {
+				const zend_function *fn = zend_get_closure_method_def(Z_OBJ_P(callable));
+
+				if (fn->common.fn_flags & ZEND_ACC_FAKE_CLOSURE) {
+					if (fn->common.scope) {
+						return zend_create_member_string(fn->common.scope->name, fn->common.function_name);
+					} else {
+						return zend_string_copy(fn->common.function_name);
+					}
+				}
+			}
+
 			return zend_string_concat2(
 				ZSTR_VAL(ce->name), ZSTR_LEN(ce->name),
 				"::__invoke", sizeof("::__invoke") - 1);
diff --git a/ext/standard/tests/file/bug72666_variation3.phpt b/ext/standard/tests/file/bug72666_variation3.phpt
index a491640c4f746..7937bd904ad7d 100644
--- a/ext/standard/tests/file/bug72666_variation3.phpt
+++ b/ext/standard/tests/file/bug72666_variation3.phpt
@@ -5,23 +5,11 @@ Bug #72666 (stat cache clearing inconsistent - plain wrapper)
 $filename = __DIR__ . '/bug72666_variation3.txt';
 
 file_put_contents($filename, "test");
-$fd = fopen($filename, "r");
-$atime1 = fileatime($filename);
-sleep(1);
-var_dump(fread($fd, 4));
-$atime2 = fileatime($filename);
 $mtime1 = filemtime($filename);
-fclose($fd);
 $fd = fopen($filename, "w");
 sleep(1);
 var_dump(fwrite($fd, "data"));
 $mtime2 = filemtime($filename);
-if (substr(PHP_OS, 0, 3) == 'WIN') {
-    // Windows do not hundle atime
-    var_dump($atime2 == $atime1);
-} else {
-    var_dump($atime2 > $atime1);
-}
 var_dump($mtime2 > $mtime1);
 ?>
 --CLEAN--
@@ -29,7 +17,5 @@ var_dump($mtime2 > $mtime1);
 unlink(__DIR__ . '/bug72666_variation3.txt');
 ?>
 --EXPECT--
-string(4) "test"
 int(4)
 bool(true)
-bool(true)
diff --git a/sapi/fpm/fpm/fpm_php.c b/sapi/fpm/fpm/fpm_php.c
index d93459b4ea370..fb02a3e191775 100644
--- a/sapi/fpm/fpm/fpm_php.c
+++ b/sapi/fpm/fpm/fpm_php.c
@@ -93,7 +93,21 @@ int fpm_php_apply_defines_ex(struct key_value_s *kv, int mode) /* {{{ */
 	if (!strcmp(name, "extension") && *value) {
 		zval zv;
 		zend_interned_strings_switch_storage(0);
+
+#if ZEND_RC_DEBUG
+		bool orig_rc_debug = zend_rc_debug;
+		/* Loading extensions after php_module_startup() breaks some invariants.
+		 * For instance, it will update the refcount of persistent strings,
+		 * which is normally not allowed at this stage. */
+		zend_rc_debug = false;
+#endif
+
 		php_dl(value, MODULE_PERSISTENT, &zv, 1);
+
+#if ZEND_RC_DEBUG
+		zend_rc_debug = orig_rc_debug;
+#endif
+
 		zend_interned_strings_switch_storage(1);
 		return Z_TYPE(zv) == IS_TRUE ? FPM_PHP_INI_EXTENSION_LOADED : FPM_PHP_INI_EXTENSION_FAILED;
 	}