Fix bug #65051: count() off by one inside unset()

nNumOfElements was incremented after the pDestructor code, so any
code in the dtor would get a wrong number of elements.

Right now the bucket deletion code is replicated in four places,
it should probably be moved off into one function (or rather,
zend_hash_apply_deleter should be used everywhere). The codes are
subtly different though in that the HANDLE_UNBLOCK_INTERRUPTIONS()
happens in different places. In particular it seems odd that in
some cases interruptions stay blocked during the destructor call.

NEWS

@@ -10,6 +10,7 @@ PHP                                                                        NEWS
   . Fixed bug #64934 (Apache2 TS crash with get_browser()). (Anatol)
   . Fixed bug #64166 (quoted-printable-encode stream filter incorrectly
     discarding whitespace). (Michael M Slusarz)
+  . Fixed bug #65051 (count() off by one inside unset()). (Nikita)
 
 - FPM:
   . Implemented FR #64764 (add support for FPM init.d script). (Lior Kaplan)

Zend/tests/bug65051.phpt

@@ -0,0 +1,23 @@
+--TEST--
+Bug #65051: count() off by one inside unset()
+--FILE--
+<?php
+
+class Foo {
+    public $array;
+
+    public function __destruct() {
+        var_dump(count($this->array[0]));
+        var_dump($this->array[0]);
+    }
+}
+
+$array = [[new Foo]];
+$array[0][0]->array =& $array;
+unset($array[0][0]);
+
+?>
+--EXPECT--
+int(0)
+array(0) {
+}

Zend/zend_hash.c

@@ -527,6 +527,7 @@ ZEND_API int zend_hash_del_key_or_index(HashTable *ht, const char *arKey, uint n
 			if (ht->pInternalPointer == p) {
 				ht->pInternalPointer = p->pListNext;
 			}
+			ht->nNumOfElements--;
 			if (ht->pDestructor) {
 				ht->pDestructor(p->pData);
 			}
@@ -535,7 +536,6 @@ ZEND_API int zend_hash_del_key_or_index(HashTable *ht, const char *arKey, uint n
 			}
 			pefree(p, ht->persistent);
 			HANDLE_UNBLOCK_INTERRUPTIONS();
-			ht->nNumOfElements--;
 			return SUCCESS;
 		}
 		p = p->pNext;
@@ -1320,6 +1320,7 @@ ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, const
 					if (ht->pInternalPointer == p) {
 						ht->pInternalPointer = p->pListNext;
 					}
+					ht->nNumOfElements--;
 					if (ht->pDestructor) {
 						ht->pDestructor(p->pData);
 					}
@@ -1327,7 +1328,6 @@ ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, const
 						pefree(p->pData, ht->persistent);
 					}
 					pefree(p, ht->persistent);
-					ht->nNumOfElements--;
 					HANDLE_UNBLOCK_INTERRUPTIONS();
 					return FAILURE;
 				}
@@ -1355,6 +1355,7 @@ ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, const
 			if (ht->pInternalPointer == q) {
 				ht->pInternalPointer = q->pListNext;
 			}
+			ht->nNumOfElements--;
 			if (ht->pDestructor) {
 				ht->pDestructor(q->pData);
 			}
@@ -1362,7 +1363,6 @@ ZEND_API int zend_hash_update_current_key_ex(HashTable *ht, int key_type, const
 				pefree(q->pData, ht->persistent);
 			}
 			pefree(q, ht->persistent);
-			ht->nNumOfElements--;
 		}
 
 		if (p->pNext) {