You should make the change to laravel/laravel 5.1 as well, let's not worsen the support nightmare that is coming.

Running php artisan clear-complied after update will use the old compiled laravel code which can cause errors when updating.

That is why i changed it in commit c334e47.

Yes I know, but we can't rely on having a working install before..
Ideally, it would be done with running php artisan at all. So for example:

"php -r \"@unlink('bootstrap/cache/compiled.php');@unlink('bootstrap/cache/services.json');\""

But that would have the downside of not being able to change it.

Or we could check if the autoload exists in the artisan file. If not, assume we're on a fresh install and just skip, without producing an error/stopping composer.

Your suggestion for the check seems to be the best option.

We can't rely on composer and the location of the files can change for instance I have bootstrap/cache/compiled.php and bootstrap/cache/services.php.

Is this needed for Laravel 4.2?

4.2 is not supported

I just need to know if I need to apply this change to my 4.2 projects

As people encountering the issue may land on this page, note an improved fix has been implemented since then. See laravel/framework#12827 and #3699.

What about people with old 5.1 projects that they are checking out from source control, ie not installing Laravel from scratch?

@omarjebari Well what i've found useful was first running
composer install --no-script
the run a normal composer install after to execute the scripts as a workaround not the best but will have to do for now for me.

The latest version which can be installed on command line, it still has the same problem. And "composer install --no-script" does not work on this version. How can I fix it?

You should apply #3699 to your existing projects.

I have viewed that, but I think I cannot fix the problem.

I always use "composer create-project --prefer-dist laravel/laravel blog" to install laravel
but now it does not work.
After install, if success, I run : php artisan -V
it will show "Laravel Framework version 5.2.32"

But now, it just show error. bootstrap/autoload.php on line 17

Please help me.

I fixed it

@ramseyjiang I got the same problem. What did you do with it?

@ramseyjiang i have the same issue but i downloaded a project in my company and i'm trying to do composer install but display this http://stackoverflow.com/questions/39665219/why-does-composer-install-show-this-error-message what i should do?