record_conflicts.diff

diff --git a/Zend/zend_hash.c b/Zend/zend_hash.c
index 1d6519e..26d6448 100644
--- a/Zend/zend_hash.c
+++ b/Zend/zend_hash.c
@@ -40,6 +40,12 @@

 #define HT_POISONED_PTR ((HashTable *) (intptr_t) -1)

+static void record_conflicts() {
+	FILE *fp = fopen("/tmp/conflicts.log", "a");
+	fprintf(fp, "1\n");
+	fclose(fp);
+}
+
 #if ZEND_DEBUG

 #define HT_OK					0x00
@@ -690,6 +696,9 @@ add_to_hash:
 	p->h = h = ZSTR_H(key);
 	nIndex = h | ht->nTableMask;
 	Z_NEXT(p->val) = HT_HASH_EX(arData, nIndex);
+	if (UNEXPECTED(Z_NEXT(p->val) != HT_INVALID_IDX)) {
+		record_conflicts();
+	}
 	HT_HASH_EX(arData, nIndex) = HT_IDX_TO_HASH(idx);
 	ZVAL_COPY_VALUE(&p->val, pData);

@@ -758,6 +767,9 @@ add_to_hash:
 	ZVAL_COPY_VALUE(&p->val, pData);
 	nIndex = h | ht->nTableMask;
 	Z_NEXT(p->val) = HT_HASH(ht, nIndex);
+	if (UNEXPECTED(Z_NEXT(p->val) != HT_INVALID_IDX)) {
+		record_conflicts();
+	}
 	HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(idx);

 	return &p->val;
@@ -947,6 +959,9 @@ add_to_hash:
 	nIndex = h | ht->nTableMask;
 	ZVAL_COPY_VALUE(&p->val, pData);
 	Z_NEXT(p->val) = HT_HASH(ht, nIndex);
+	if (UNEXPECTED(Z_NEXT(p->val) != HT_INVALID_IDX)) {
+		record_conflicts();
+	}
 	HT_HASH(ht, nIndex) = HT_IDX_TO_HASH(idx);

 	return &p->val;