Composer PSR-4自动加载“找不到类".调试 [英] Composer PSR-4 autoloading "class not found" debug

问题描述

是有关找不到类"错误的另一个问题.我可能丢失了一些东西，或者我误解了PSR-4逻辑.

Yes another question about the "class not found" error. Either I am missing something, or I misunderstood the PSR-4 logic.

我的作曲家库目录结构:

My composer library directory sturcture:

扫描仪" =>"src" =>"Test.php"

"Scanner" => "src" => "Test.php"

Test.php

namespace MyNS;

class Test
{
}

composer.json

composer.json

"autoload": {
        "psr-4": {
            "MyNS\\": "src/"
        },
}

因此，现在我使用composer将库加载到我的项目中，并尝试使用它.

So, now I load the library in my project with composer and try using it.

require_once("../vendor/autoload.php");

$test = new MyNS\Test();

总是导致

致命错误:未捕获的错误:未找到类'MyNS \ Test'."

"Fatal error: Uncaught Error: Class 'MyNS\Test' not found."

.我想念什么?我现在正盯着这几天.我更改了文件夹，更改了文件夹名称，更改了uppper的值，反之亦然.似乎什么都没用.

. What am I missing? I am staring at this for days now. I have changed folders, I have changed folder names, I have changed uppper to lower and vise versa. Nothing seems to work.

我正在使用PHP 7.2.2和Composer 1.2.2版

I am using PHP 7.2.2 and Composer version 1.2.2

甚至尝试过:

require_once("../vendor/autoload.php");

use MyNS\Test;

$scanner = new Test();

更新

我调试了Composer ClassLoader.php文件(findFileWithExtension($ class，$ ext))方法，显然我的文件从未加载过，因为我收到了回声"Done"和die();.在此方法的末尾，这意味着找不到文件，因此未加载该文件.我的composer.json有什么问题?

Update

I debugt the Composer ClassLoader.php file (findFileWithExtension($class, $ext)) method and apparently my files are never loaded because I get put an echo "Done" and a die(); at the end of this method which means the file is not found and thus not loaded. What is wrong with my composer.json?

{
    "name": "test/test",
    "type": "library",
    "description": "",
    "keywords": ["php"],
    "homepage": "",
    "license": "MIT",
    "authors": [
        {
            "name": "",
            "email": "",
            "homepage": "",
            "role": ""
        }
    ],
    "require": {
        "php": ">=7.2.2"
    },
    "autoload": {
        "psr-4": {
            "MyNS\\": "src/"
        }
    }
}

推荐答案

要调试打开的ClassLoader.php文件，然后转到定义findFileWithExtension()方法的位置添加echo语句:

To debug what is happening open ClassLoader.php file then go where findFileWithExtension() method is defined to add an echo statement:

# vendor/composer/ClassLoader.php:386

foreach ($this->prefixDirsPsr4[$search] as $dir) {
    if (file_exists($file = $dir . $pathEnd)) {
        return $file;
    }
    // Add this line
    echo $file, PHP_EOL;
}

在手动完成上述文件的修改后，请不要执行composer dumpautoload.

现在，通过执行PHP文件，您将在输出的开始看到类似的内容:

Now by executing your PHP file you will see something similar to this at the very beginning of output:

path/to/project/vendor/composer/../../src/Test.php

哪个是:

path/to/project/src/Test.php

这是作曲家正在寻找的文件，并且应包含以下内容:

So this is the file that composer is looking for and should contain something like this:

namespace MyNS;

class Test { }

如果包含文件存在问题，则意味着您必须关心三件事:

If there is an issue in including the file then it means you have to care about three things:

1. 路径和文件名
2. 文件中使用的命名空间
3. 文件中使用的类名(类名应与文件名相同)

这篇关于Composer PSR-4自动加载“找不到类".调试的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！