fix double-free segfaults

Props @vnsavage

Author: aidvu

zend/callable.cpp

@@ -124,6 +124,10 @@ void Callable::initialize(zend_function_entry *entry, const char *classname, int
     entry->arg_info = _argv.get();
     entry->num_args = _argc;
     entry->flags = flags;
+#if PHP_VERSION_ID >= 80400
+    entry->frameless_function_infos = nullptr;
+    entry->doc_comment = nullptr;
+#endif
 
     // we should fill the first argument as well
     initialize((zend_internal_function_info*)_argv.get(), classname);

zend/classimpl.cpp

@@ -23,8 +23,11 @@ ClassImpl::~ClassImpl()
     // destruct the entries
     delete[] _entries;
 
+    // PHP 8.4 frees doc_comment if not null, so skip.
+#if PHP_VERSION_ID < 80400
     // free the stored pointer
     if (_self) zend_string_release(_self);
+#endif
 }
 
 /**