Fixed empty array inference

Author: dstogov

Zend/Optimizer/zend_inference.c

@@ -2674,6 +2674,9 @@ static zend_always_inline zend_result _zend_update_type_info(
 				}
 			}
 			if (opline->extended_value == IS_ARRAY) {
+				if (t1 & (MAY_BE_UNDEF|MAY_BE_NULL)) {
+					tmp |= MAY_BE_ARRAY_EMPTY;
+				}
 				if (t1 & MAY_BE_ARRAY) {
 					tmp |= t1 & (MAY_BE_ARRAY_KEY_ANY | MAY_BE_ARRAY_OF_ANY | MAY_BE_ARRAY_OF_REF);
 				}
@@ -3387,6 +3390,9 @@ static zend_always_inline zend_result _zend_update_type_info(
 					arr_type = RES_USE_INFO();
 				}
 				tmp = MAY_BE_RC1|MAY_BE_ARRAY|arr_type;
+				if (opline->opcode == ZEND_INIT_ARRAY && opline->op1_type == IS_UNUSED) {
+					tmp |= MAY_BE_ARRAY_EMPTY;
+				}
 				if (opline->op1_type != IS_UNUSED
 				 && (opline->op2_type == IS_UNUSED
 				  || (t2 & (MAY_BE_UNDEF|MAY_BE_NULL|MAY_BE_FALSE|MAY_BE_TRUE|MAY_BE_LONG|MAY_BE_DOUBLE|MAY_BE_RESOURCE|MAY_BE_STRING)))) {