What is the main role of PSR standards in PHP application development?

The main role of PSR (PHP Standards Recommendations) standards is to ensure uniformity and compatibility of code in PHP applications. They set common rules for formatting, autoloading, naming, code structure, and component interaction, which facilitates maintenance, scaling, and integration of various libraries and frameworks.

For example, PSR-4 describes the autoloading standard for classes, allowing automatic inclusion of necessary files without manual require. This reduces the likelihood of errors and simplifies project organization.