More consistent unset error message

Author: Girgias

Zend/zend.c

@@ -1732,7 +1732,7 @@ ZEND_API ZEND_COLD void zend_illegal_container_offset(const zend_string *contain
 			if (zend_string_equals(container, ZSTR_KNOWN(ZEND_STR_STRING))) {
 				zend_throw_error(NULL, "Cannot unset string offsets");
 			} else {
-				zend_type_error("Cannot access offset of type %s in unset", zend_zval_type_name(offset));
+				zend_type_error("Cannot unset offset of type %s on %s", zend_zval_type_name(offset), ZSTR_VAL(container));
 			}
 			return;
 		default:

ext/spl/tests/ArrayObject_illegal_offset.phpt

@@ -36,4 +36,4 @@ Cannot access offset of type array on ArrayObject
 Cannot access offset of type array on ArrayObject
 Cannot access offset of type array on ArrayObject
 Cannot access offset of type array in isset or empty
-Cannot access offset of type array in unset
+Cannot unset offset of type array on ArrayObject