Why PSR-0

• Every library include their own autoloading magic
• Don't repeat yourself
• I want autoload, which library is built for me?

PSR-0: Mapping

# Mapping:
# -------

MasterNamespace           ----> /path/to/lib-root/

# Finding:
# -------

MasterNamespace\ClassName 
  --> /path/to/lib-root/MasterNamespace/ClassName.php

# Backward compatible:
# -------

MasterNamespace_ClassName 
  --> /path/to/lib-root/MasterNamespace/ClassName.php

Simple convention

Work for all

But…

PSR-4

• A better PSR-0

• But breaks backward compatibility

PSR-4: Just got better

// Mapping
CompanyName\Project --> /path/to/root/


// Finding
CompanyName\Project\Foo\ClassName
    --> /path/to/root/Foo/ClassName.php

xautoload.module

Modern autoloading for Drupal 7

my_module.info

name = My modern module

version = 7.x-1.0-dev

core = 7.x

dependencies[] = xautoload

{module root}/

/src/PSR4Demo.php

/lib/Drupal/my_module/PSR0Demo.php

<?php

function excited() {
  $p0  = new Drupal\my_module\PSR0Demo();
  $p4 = new Drupal\my_module\PSR4Demo();
}