Modernizing Legacy Applications in PHP

Common Questions

What If I Already Have An Autoloader?

Some legacy applications may already have a custom autoloader in place. If this is our situation, we have some options:

1. Use the existing autoloader as-is: This is our best option if there is already a central directory location for the application class files.
2. Modify the existing autoloader to add PSR-0 behavior: This is a good option if the autoloader does not conform to PSR-0 recommendations.
3. Register the PSR-0 autoloader described in this chapter with SPL in addition to the existing autoloader. This is another good option when the existing autoloader does not conform to PSR-0 recommendations.

Other legacy codebases may have a third-party autoloader in place, such as Composer. If Composer is ...