[英]PSR-4 autoloader
我正在從https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md測試PSR-4自動加載器,但某些方法無法正常工作。
錯誤:
致命錯誤:未捕獲錯誤:在C:\\ xampp \\ htdocs \\ Home \\ foo-bar \\ index.php:11中找不到類'Foo \\ Bar \\ Qux \\ Quux':堆棧跟蹤:#0 {main}拋出在C:\\第11行上的xampp \\ htdocs \\ Home \\ foo-bar \\ index.php
線:
新\\ Foo \\ Bar \\ Qux \\ Quux;
我的文件:
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";
}
}
謝謝您的幫助。
在index.php中更改它:
$loader->addNamespace('Foo\Bar\Qux', __DIR__ . '/src/Qux');
$loader->addNamespace('Foo\Bar\Qux', __DIR__ . '/tests/Qux');
PSR-4-autoloader-examples.md
文檔中存在錯誤。
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