From 518ad7039062c3c0245f521df3ee1c55b05e2a8c Mon Sep 17 00:00:00 2001
From: Scott MacVicar <scottmac@php.net>
Date: Tue, 9 Jun 2009 01:57:57 +0000
Subject: [PATCH] Fix bug #48493 - spl_autoload_register can leave the HT in an
 inconsistent way. Need to point the second elements previous item to head so
 we can traverse upwards.

---
 ext/spl/php_spl.c           |  1 +
 ext/spl/tests/bug48493.phpt | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 ext/spl/tests/bug48493.phpt

diff --git a/ext/spl/php_spl.c b/ext/spl/php_spl.c
index 2ffb4d89bb..a9f954aa6e 100755
--- a/ext/spl/php_spl.c
+++ b/ext/spl/php_spl.c
@@ -409,6 +409,7 @@ PHP_FUNCTION(spl_autoload_call)
 	(ht)->pListTail->pListNext = (ht)->pListHead;			\
 	(ht)->pListHead = (ht)->pListTail;						\
 	(ht)->pListTail = (ht)->pListHead->pListLast;			\
+	(ht)->pListHead->pListNext->pListLast = (ht)->pListHead;\
 	(ht)->pListTail->pListNext = NULL;						\
 	(ht)->pListHead->pListLast = NULL;
 
diff --git a/ext/spl/tests/bug48493.phpt b/ext/spl/tests/bug48493.phpt
new file mode 100644
index 0000000000..eee925902c
--- /dev/null
+++ b/ext/spl/tests/bug48493.phpt
@@ -0,0 +1,26 @@
+--TEST--
+SPL: Bug #48493 spl_autoload_unregister() can't handle prepended functions
+--FILE--
+<?php
+function autoload1() {}
+
+function autoload2() {}
+
+spl_autoload_register('autoload2');
+spl_autoload_register('autoload1', true, true);
+var_dump(spl_autoload_functions());
+
+spl_autoload_unregister('autoload2');
+var_dump(spl_autoload_functions());
+?>
+--EXPECT--
+array(2) {
+  [0]=>
+  unicode(9) "autoload1"
+  [1]=>
+  unicode(9) "autoload2"
+}
+array(1) {
+  [0]=>
+  unicode(9) "autoload1"
+}
-- 
2.50.1