如何在不使用Composer作为依赖项(PSR-0)的情况下使用具有命名空间的PHP库? [英] How to use a PHP library with namespacing without Composer as dependency (PSR-0)?

问题描述

我需要使用一些具有依赖关系的PHP库，但是我对客户端的Web服务器有一些限制.这是一台托管的网络服务器，我无法通过SSH使用控制台.

I need to use some PHP libraries with dependencies but I have some restrictions on the webserver of the client. It is a managed webserver and I can not use a console eg over SSH.

那么，现在如何在没有Composer的情况下使用这些库?
我可以手动创建一些目录吗，需要创建哪些目录或路径? 另外，我需要创建什么才能使自动加载和命名空间正常工作?

So how do I use now these libraries without Composer?
Can I create some directories manually and what directories or paths do I need to create? Also, what do I need to create so autoloading and namespacing is working?

我可以手动创建autoload.php吗?文件的内容是什么?

Can I create the autoload.php somehow manually and what is the content of the file?

推荐答案

一个简单的自动加载器是可能的，并且操作起来并不难:

It is possible with a simple autoloader and it is not so hard to do it:

function __autoload($className)
{
    $className = ltrim($className, '\\');
    $fileName  = '';
    $namespace = '';
    if ($lastNsPos = strripos($className, '\\')) {
        $namespace = substr($className, 0, $lastNsPos);
        $className = substr($className, $lastNsPos + 1);
        $fileName  = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
    }
    $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';
    // $fileName .= $className . '.php'; //sometimes you need a custom structure
    //require_once "library/class.php"; //or include a class manually
    require $fileName;

}

但是有时您必须调整$fileName，使其适用于所有库.它取决于自动加载的标准以及库的类名的命名方式.有时，您必须在_上拆分类名称，并使用第一个元素作为目录名称，并将其也添加到类名称中.例如，我有第二个库，其类类似于Library_Parser，但结构为Library/library-parser.php.

But sometimes you have to adjust the $fileName so it works with all libraries. It depends on the standard for autoloading and how the class names of the libraries are named. Sometimes you have to split the classname on _ and use the first element for the direcotry name and add this also to the class name. I had for example a second library with a class like Library_Parser but the structure was Library/library-parser.php.

第一个库直接与上面的代码一起使用，并且所有类都被自动加载.

The first library worked directly with the above code and all classes were automatically loaded.

该代码来自 http://www.sitepoint .com/autoloading-and-the-psr-0-standard/，但我不得不更正一些代码部分(其他下划线和反斜杠).我已经使用了PSR-0标准解决方案.

The code was taken from http://www.sitepoint.com/autoloading-and-the-psr-0-standard/ but I had to correct some code parts (additional underscores and backslashes). I have used the PSR-0 Standard solution.

PSR-4版本，由 https://stackoverflow.com/users/1740659/thibault :

PSR-4 version by https://stackoverflow.com/users/1740659/thibault:

function loadPackage($dir)
{
    $composer = json_decode(file_get_contents("$dir/composer.json"), 1);
    $namespaces = $composer['autoload']['psr-4'];

    // Foreach namespace specified in the composer, load the given classes
    foreach ($namespaces as $namespace => $classpaths) {
        if (!is_array($classpaths)) {
            $classpaths = array($classpaths);
        }
        spl_autoload_register(function ($classname) use ($namespace, $classpaths, $dir) {
            // Check if the namespace matches the class we are looking for
            if (preg_match("#^".preg_quote($namespace)."#", $classname)) {
                // Remove the namespace from the file path since it's psr4
                $classname = str_replace($namespace, "", $classname);
                $filename = preg_replace("#\\\\#", "/", $classname).".php";
                foreach ($classpaths as $classpath) {
                    $fullpath = $dir."/".$classpath."/$filename";
                    if (file_exists($fullpath)) {
                        include_once $fullpath;
                    }
                }
            }
        });
    }
}

loadPackage(__DIR__."/vendor/project");

new CompanyName\PackageName\Test();

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