From a4f8bc30d31f5cc9e7703f4c564b49bc0c00a31b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A2=A8=E5=A8=98?= <30471441@qq.com>
Date: Fri, 26 Nov 2021 15:40:50 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E5=8D=95=E5=85=83=E6=B5=8B?=
 =?UTF-8?q?=E8=AF=95=E5=9C=A8PHP7.4+=E7=89=88=E6=9C=AC=E4=B8=AD=E5=87=BA?=
 =?UTF-8?q?=E7=8E=B0=E6=8A=A5=E9=94=99=E7=9A=84=E9=97=AE=E9=A2=98?=
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---
 tests/Material/Queue.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/Material/Queue.php b/tests/Material/Queue.php
index 1f1e033..5adc60e 100644
--- a/tests/Material/Queue.php
+++ b/tests/Material/Queue.php
@@ -18,7 +18,7 @@ class Queue
 
     public static function push(string $name, $value): int
     {
-        if (!is_array(self::$data[$name])) {
+        if (!is_array(self::$data[$name] ?? null)) {
             self::$data[$name] = [];
         }
         return array_push(self::$data[$name], $value);
@@ -26,7 +26,7 @@ class Queue
 
     public static function shift(string $name)
     {
-        if (!is_array(self::$data[$name])) {
+        if (!is_array(self::$data[$name] ?? null)) {
             return null;
         }
         return array_shift(self::$data[$name]);
-- 
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