In what scenarios would it be advisable to use alternative methods, like git cloning, instead of relying solely on Composer for managing project dependencies in PHP?

When dealing with dependencies that are not available on Packagist or require specific configurations, it may be advisable to use alternative methods like git cloning to manage project dependencies in PHP. This allows for more flexibility in handling dependencies that are not easily installable via Composer.

// Example of using git cloning to manage project dependencies
exec('git clone https://github.com/vendor/package.git');