PHP编译错误:“无法在数组中使用空数组元素" [英] PHP Compile Error: "Cannot use empty array elements in arrays"

问题描述

我有一个Laravel 5项目，该项目正在使用 bepsvpt/secure-headers 包使用以下配置文件:

I have a Laravel 5 project that is using the bepsvpt/secure-headers package with the following config file:

<?php

return [
    'x-content-type-options' => 'nosniff',
    'x-download-options' => 'noopen',
    'x-frame-options' => 'sameorigin',
    'x-permitted-cross-domain-policies' => 'none',
    'x-xss-protection' => '1; mode=block',

    /*
     * Referrer-Policy
     *
     * Reference: https://w3c.github.io/webappsec-referrer-policy
     *
     * Available Value: 'no-referrer', 'no-referrer-when-downgrade', 'origin', 'origin-when-cross-origin',
     *                  'same-origin', 'strict-origin', 'strict-origin-when-cross-origin', 'unsafe-url'
     */

    'referrer-policy' => 'strict-origin-when-cross-origin',

    'hsts' => [
        'enable' => env('SECURITY_HEADER_HSTS_ENABLE', false),
        'max-age' => 15552000,
        'include-sub-domains' => false,
    ],

    /*
     * Content Security Policy
     *
     * Reference: https://developer.mozilla.org/en-US/docs/Web/Security/CSP
     *
     * csp will be ignored if custom-csp is not null.
     *
     * Note: custom-csp does not support report-only.
     */

    'custom-csp' => env('SECURITY_HEADER_CUSTOM_CSP', null),

    'csp' => [
        'report-only' => false,

        'report-uri' => env('CONTENT_SECURITY_POLICY_REPORT_URI', false),,

        'upgrade-insecure-requests' => false,

        'base-uri' => [
            //
        ],

        'default-src' => [
            //
        ],

        'child-src' => [
            //
        ],

        'script-src' => [
            'allow' => [
                //
            ],

            'hashes' => [
                // ['sha256' => 'hash-value'],
            ],

            'nonces' => [
                //
            ],

            'self' => false,

            'unsafe-inline' => false,

            'unsafe-eval' => false,
        ],

        'style-src' => [
            'allow' => [
                //
            ],

            'self' => false,

            'unsafe-inline' => false,
        ],

        'img-src' => [
            'allow' => [
                //
            ],

            'types' => [
                //
            ],

            'self' => false,

            'data' => false,
        ],

        /*
         * The following directives are all use 'allow' and 'self' flag.
         *
         * Note: default value of 'self' flag is false.
         */

        'font-src' => [
            //
        ],

        'connect-src' => [
            //
        ],

        'form-action' => [
            //
        ],

        'frame-ancestors' => [
            //
        ],

        'media-src' => [
            //
        ],

        'object-src' => [
            //
        ],

        /*
         * plugin-types only support 'allow'.
         */

        'plugin-types' => [
            //
        ],
    ],
];

当我尝试运行应用程序(Web请求或php artisan)时，出现以下错误:

When I try to run the application (web request or php artisan), I get the following error:

PHP Fatal error:  Cannot use empty array elements in arrays in C:\Web\myapp\config\secure-headers.php on line 4

当然，文件的第4行看起来还不错！

Of course, line 4 of the file looks totally fine!

这是什么问题?

推荐答案

此错误(我在网上可以找到的任何地方都没有发现)是由于连续两个逗号而数组中没有逗号引起的.

This error, which is not documented anywhere I can find online, comes from having two commas in a row with nothing between them inside the array.

就我而言，它实际上出现在文件的第42行，而不是错误消息所指示的第4行，这听起来像是编译器中的一个错误，该错误标识了数组中的第一项而不是数组的实际位置. 空数组元素".

In my case, this actually appeared on line 42 of the file, not line 4 as indicated by the error message, which sounds like a bug in the compiler which identifies the first item in the array instead of the actual location of the "empty array element".

注意:在PHP 7.2.15 +，7.3.2 +和7.4.0+中，错误消息已更改为报告前一个有效元素的行号，而不是数组开头的行号. .尽管可能仍需要一行或多行来解决，但通常离问题足够近，可以很容易地找到它.

NOTE: In PHP 7.2.15+, 7.3.2+, and 7.4.0+, the error message has been changed to report the line number of the previous valid element instead of the line number of the beginning of the array. While this may still be off by one or more lines, it is usually close enough to the problem to make it much easier to find.

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