What are some potential pitfalls of using a custom autoloader for PHP classes?

One potential pitfall of using a custom autoloader for PHP classes is that it may not adhere to the PSR-4 standard, causing compatibility issues with third-party libraries that rely on this standard for autoloading classes. To solve this issue, it is recommended to follow the PSR-4 standard when implementing a custom autoloader. 

spl_autoload_register(function ($class) {
    // PSR-4 autoloader implementation
    $prefix = 'Vendor\\Namespace\\';
    $base_dir = __DIR__ . '/src/';

    $len = strlen($prefix);
    if (strncmp($prefix, $class, $len) !== 0) {
        return;
    }

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

    if (file_exists($file)) {
        require $file;
    }
});

Keywords

custom autoloader PHP classes namespace conflicts class loading errors performance overhead

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