从PHP中的空值创建默认对象? [英] Creating default object from empty value in PHP?

问题描述

仅在将我的PHP环境升级到PHP 5.4及更高版本后，我才看到此错误.错误指向以下代码行:

I see this error only after upgrading my PHP environment to PHP 5.4 and beyond. The error points to this line of code:

错误:

从空值创建默认对象

Creating default object from empty value

代码:

$res->success = false;

我首先需要声明我的$res对象吗?

Do I first need to declare my $res object?

推荐答案

您的新环境可能具有E_STRICT警告

Your new environment may have E_STRICT warnings enabled in error_reporting for PHP versions <= 5.3.x, or simply have error_reporting set to at least E_WARNING with PHP versions >= 5.4. That error is triggered when $res is NULL or not yet initialized:

$res = NULL;
$res->success = false; // Warning: Creating default object from empty value

如果$res已经初始化为某个值但不是对象，则

PHP将报告不同的错误消息:

PHP will report a different error message if $res is already initialized to some value but is not an object:

$res = 33;
$res->success = false; // Warning: Attempt to assign property of non-object

为了符合PHP 5.4之前的E_STRICT标准或PHP> = 5.4中的常规E_WARNING错误级别，假设您尝试创建通用对象并分配属性success，则需要声明$res作为全局命名空间中stdClass的对象:

In order to comply with E_STRICT standards prior to PHP 5.4, or the normal E_WARNING error level in PHP >= 5.4, assuming you are trying to create a generic object and assign the property success, you need to declare $res as an object of stdClass in the global namespace:

$res = new \stdClass();
$res->success = false;

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