diff --git a/Zend/tests/bug79668.phpt b/Zend/tests/bug79668.phpt
new file mode 100644
index 00000000000..5e73a7469b6
--- /dev/null
+++ b/Zend/tests/bug79668.phpt
@@ -0,0 +1,16 @@
+--TEST--
+Bug #79668 (get_defined_functions(true) may miss functions)
+--INI--
+disable_functions=sha1_file,password_hash
+--FILE--
+<?php
+$df = get_defined_functions(true);
+foreach (['sha1', 'sha1_file', 'hash', 'password_hash'] as $funcname) {
+    var_dump(in_array($funcname, $df['internal'], true));
+}
+?>
+--EXPECT--
+bool(true)
+bool(false)
+bool(true)
+bool(false)