PSR-4自动装带器

Question

I'm testing PSR-4 autoloader from https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md and something is not working.

Error:

Fatal error: Uncaught Error: Class 'Foo\\Bar\\Qux\\Quux' not found in C:\\xampp\\htdocs\\Home\\foo-bar\\index.php:11 Stack trace: #0 {main} thrown in C:\\xampp\\htdocs\\Home\\foo-bar\\index.php on line 11

Line:

new \\Foo\\Bar\\Qux\\Quux;

My files:

• index.php
• example
  • loader.php
• src
  • Qux
    • Quux.php
  • Baz.php
• tests
  • Qux
    • Quux.php
  • BazTest.php

index.php:

<?php

require_once "Example/loader.php";
$loader = new \Example\Psr4AutoloaderClass;

$loader->register();

$loader->addNamespace('Foo\Bar', '/src');
$loader->addNamespace('Foo\Bar', '/tests');

new \Foo\Bar\Qux\Quux;

loader.php:

<?php namespace Example;

class Psr4AutoloaderClass
{
    protected $prefixes = array();

    public function register()
    {
        spl_autoload_register(array($this, 'loadClass'));
    }

    public function addNamespace($prefix, $base_dir, $prepend = false)
    {
        // normalize namespace prefix
        $prefix = trim($prefix, '\\') . '\\';

        // normalize the base directory with a trailing separator
        $base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';

        // initialize the namespace prefix array
        if (isset($this->prefixes[$prefix]) === false) {
            $this->prefixes[$prefix] = array();
        }

        // retain the base directory for the namespace prefix
        if ($prepend) {
            array_unshift($this->prefixes[$prefix], $base_dir);
        } else {
            array_push($this->prefixes[$prefix], $base_dir);
        }
    }

    public function loadClass($class)
    {
        // the current namespace prefix
        $prefix = $class;

        while (false !== $pos = strrpos($prefix, '\\')) {

            // retain the trailing namespace separator in the prefix
            $prefix = substr($class, 0, $pos + 1);

            // the rest is the relative class name
            $relative_class = substr($class, $pos + 1);

            // try to load a mapped file for the prefix and relative class
            $mapped_file = $this->loadMappedFile($prefix, $relative_class);
            if ($mapped_file) {
                return $mapped_file;
            }

            $prefix = rtrim($prefix, '\\');
        }

        return false;
    }

    protected function loadMappedFile($prefix, $relative_class)
    {
        // are there any base directories for this namespace prefix?
        if (isset($this->prefixes[$prefix]) === false) {
            return false;
        }

        foreach ($this->prefixes[$prefix] as $base_dir) {

            $file = $base_dir
                  . str_replace('\\', '/', $relative_class)
                  . '.php';

            // if the mapped file exists, require it
            if ($this->requireFile($file)) {
                // yes, we're done
                return $file;
            }
        }

        // never found it
        return false;
    }

    protected function requireFile($file)
    {
        if (file_exists($file)) {
            require $file;
            return true;
        }
        return false;
    }
}

Quux.php:

<?php namespace Foo\Bar\Qux;

class Quux {
    public function __construct() {
        echo "Hello";
    }
}

Thank you for your help.

Answer 1

Change this in your index.php:

$loader->addNamespace('Foo\Bar\Qux', __DIR__ . '/src/Qux');
$loader->addNamespace('Foo\Bar\Qux', __DIR__ . '/tests/Qux');

There is an error in the PSR-4-autoloader-examples.md documentation.