Provides a PSR-4 compliant autoloader implementation.

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2.0.3 2015-03-27 19:34 UTC


Provides a full PSR-4 and limited PSR-0 autoloader. Although it is installable via Composer, its best use is probably outside a Composer-oriented project.

For a full PSR-0 only autoloader, please see Aura.Autoload v1.



This library requires PHP 5.3 or later; we recommend using the latest available version of PHP as a matter of principle. It has no userland dependencies.

It is installable and autoloadable via Composer as aura/autoload.

Alternatively, download a release or clone this repository, then require or include its autoload.php file.


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To run the unit tests at the command line, issue phpunit at the package root. (This requires PHPUnit to be available as phpunit.)

This library attempts to comply with PSR-1, PSR-2, and PSR-4. If you notice compliance oversights, please send a patch via pull request.


To ask questions, provide feedback, or otherwise communicate with the Aura community, please join our Google Group, follow @auraphp on Twitter, or chat with us on #auraphp on Freenode.

Getting Started

To use the autoloader, first instantiate it, then register it with SPL autoloader stack:

// instantiate
$loader = new \Aura\Autoload\Loader;

// append to the SPL autoloader stack; use register(true) to prepend instead

PSR-4 Namespace Prefixes

To add a namespace conforming to PSR-4 specifications, point to the base directory for that namespace. Multiple base directories are allowed, and will be searched in the order they are added.

$loader->addPrefix('Foo\Bar', '/path/to/foo-bar/src');
$loader->addPrefix('Foo\Bar', '/path/to/foo-bar/tests');

To set several namespaces prefixes at once, overriding all previous prefix settings, use setPrefixes().

    'Foo\Bar' => array(

    'Baz\Dib' => array(

PSR-0 Namespaces

To add a namespace conforming to PSR-0 specifications, one that uses only namespace separators in the class names (no underscores allowed!), point to the directory containing classes for that namespace. Multiple directories are allowed, and will be searched in the order they are added.

$loader->addPrefix('Baz\Dib', '/path/to/baz-dib/src/Baz/Dib');
$loader->addPrefix('Baz\Dib', '/path/to/baz-dib/tests/Baz/Dib');

To set several namespaces prefixes at once, as with PSR-4, use setPrefixes().

Explicit Class-to-File Mappings

To map a class explictly to a file, use the setClassFile() method.

$loader->setClassFile('Foo\Bar\Baz', '/path/to/Foo/Bar/Baz.php');

To set several class-to-file mappings at once, overriding all previous mappings, use setClassFiles(). (Alternatively, use addClassFiles() to append to the existing mappings.)

    'Foo\Bar\Baz'  => '/path/to/Foo/Bar/Baz.php',
    'Foo\Bar\Qux'  => '/path/to/Foo/Bar/Qux.php',
    'Foo\Bar\Quux' => '/path/to/Foo/Bar/Quux.php',

Inspection and Debugging

These methods are available to inspect the Loader:

  • getPrefixes() returns all the added namespace prefixes and their base directories

  • getClassFiles() returns all the explicit class-to-file mappings

  • getLoadedClasses() returns all the class names loaded by the Loader and the file names for the loaded classes

If a class file cannot be loaded for some reason, review the debug information using getDebug(). This will show a log of information for the most-recent autoload attempt involving the Loader.

// set the wrong path for Foo\Bar classes
$loader->addPrefix('Foo\Bar', '/wrong/path/to/foo-bar/src');

// this will fail
$baz = new \Foo\Bar\Baz;

// examine the debug information
// array(
//     'Loading Foo\\Bar\\Baz',
//     'No explicit class file',
//     'Foo\\Bar\\: /path/to/foo-bar/Baz.php not found',
//     'Foo\\: no base dirs',
//     'Foo\\Bar\\Baz not loaded',
// )