diff --git a/ext/spl/php_spl.c b/ext/spl/php_spl.c
index 78315e9880b4..24cd66db445d 100644
--- a/ext/spl/php_spl.c
+++ b/ext/spl/php_spl.c
@@ -43,16 +43,7 @@ ZEND_TLS HashTable *spl_autoload_functions;
 
 static zend_class_entry * spl_find_ce_by_name(zend_string *name, bool autoload)
 {
-	zend_class_entry *ce;
-
-	if (!autoload) {
-		zend_string *lc_name = zend_string_tolower(name);
-
-		ce = zend_hash_find_ptr(EG(class_table), lc_name);
-		zend_string_release(lc_name);
-	} else {
-		ce = zend_lookup_class(name);
-	}
+	zend_class_entry *ce = zend_lookup_class_ex(name, NULL, autoload ? 0 : ZEND_FETCH_CLASS_NO_AUTOLOAD);
 	if (ce == NULL) {
 		php_error_docref(NULL, E_WARNING, "Class %s does not exist%s", ZSTR_VAL(name), autoload ? " and could not be loaded" : "");
 		return NULL;
diff --git a/ext/spl/tests/class_parents_leading_backslash.phpt b/ext/spl/tests/class_parents_leading_backslash.phpt
new file mode 100644
index 000000000000..be538b79db9d
--- /dev/null
+++ b/ext/spl/tests/class_parents_leading_backslash.phpt
@@ -0,0 +1,72 @@
+--TEST--
+class_parents()/class_implements()/class_uses() accept a leading backslash regardless of $autoload
+--FILE--
+<?php
+
+namespace {
+    interface Iface {}
+    trait Tr {}
+    class ParentC implements Iface {}
+    class ChildC extends ParentC {
+        use Tr;
+    }
+}
+
+namespace MyNS {
+    interface NSIface {}
+    trait NSTr {}
+    class NSParentC implements NSIface {}
+    class NSChildC extends NSParentC {
+        use NSTr;
+    }
+}
+
+namespace {
+
+// The no-autoload path missed the leading-backslash strip before the fix.
+var_dump(class_parents('\ChildC', false));
+var_dump(class_parents('\ChildC'));
+var_dump(class_implements('\ParentC', false));
+var_dump(class_uses('\ChildC', false));
+
+// Same for namespaced classes.
+var_dump(class_parents('\MyNS\NSChildC', false));
+var_dump(class_parents('\MyNS\NSChildC'));
+var_dump(class_implements('\MyNS\NSParentC', false));
+var_dump(class_uses('\MyNS\NSChildC', false));
+
+}
+?>
+--EXPECT--
+array(1) {
+  ["ParentC"]=>
+  string(7) "ParentC"
+}
+array(1) {
+  ["ParentC"]=>
+  string(7) "ParentC"
+}
+array(1) {
+  ["Iface"]=>
+  string(5) "Iface"
+}
+array(1) {
+  ["Tr"]=>
+  string(2) "Tr"
+}
+array(1) {
+  ["MyNS\NSParentC"]=>
+  string(14) "MyNS\NSParentC"
+}
+array(1) {
+  ["MyNS\NSParentC"]=>
+  string(14) "MyNS\NSParentC"
+}
+array(1) {
+  ["MyNS\NSIface"]=>
+  string(12) "MyNS\NSIface"
+}
+array(1) {
+  ["MyNS\NSTr"]=>
+  string(9) "MyNS\NSTr"
+}