What are the potential pitfalls of using autoload in a different folder structure in PHP projects?

When using autoload in a different folder structure in PHP projects, potential pitfalls may include incorrect class loading due to incorrect namespace or file path configurations. To solve this, ensure that the namespace in each class file matches the directory structure and use a PSR-4 autoloader to correctly load classes based on their namespaces. 

// Autoloader setup using PSR-4
spl_autoload_register(function ($class) {
    // project-specific namespace prefix
    $prefix = 'My\\Namespace\\';

    // base directory for the namespace prefix
    $base_dir = __DIR__ . '/src/';

    // does the class use the namespace prefix?
    $len = strlen($prefix);
    if (strncmp($prefix, $class, $len) !== 0) {
        // no, move to the next registered autoloader
        return;
    }

    // get the relative class name
    $relative_class = substr($class, $len);

    // replace the namespace prefix with the base directory, replace namespace separators with directory separators
    $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

    // if the file exists, require it
    if (file_exists($file)) {
        require $file;
    }
});

Keywords

autoload folder structure PHP projects namespace class mapping

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