Fatal error: Cannot redeclare class Symfony\Component\HttpFoundation\Response (or ResponseHeaderBag)

[ieleja]

OSX, Apache 2.4, PHP 5.6.27
Linux, Apache 2.4, PHP 5.6.28

clean Symfony Demo install with:
$ symfony demo

point browser to:
http://localhost/symfony_demo/web/en/blog/

choose:
Browse Application
Back to blog

and always get this Fatal error under OSX:
PHP Fatal error: Cannot redeclare class Symfony\Component\HttpFoundation\ResponseHeaderBag in /Users/User/Sites/symfony_demo/var/cache/prod/classes.php on line 4491
or
PHP Fatal error: Cannot redeclare class Symfony\Component\HttpFoundation\Response in /Users/User/Sites/symfony_demo/var/cache/prod/classes.php on line 3777
and under Linux:
PHP Fatal error: Cannot redeclare class Symfony\Component\HttpFoundation\ResponseHeaderBag in /var/www/symfony_demo/var/cache/prod/classes.php on line 4491

clearing cache helps exactly one time, up to server recreates cache files

error reproduces in Chrome, Firefox, Safari

[bocharsky-bw]

What version of symfony/symfony do you use?

[voronkovich]

@ieleja, do you clean the cache manually, without warmup? Try to use php bin/console cache:clear --env=prod --no-debug.

[ieleja]

bash-3.2$ bin/console --version
Symfony 3.2.0 (kernel: app, env: dev, debug: true)

==============

bash-3.2$ php bin/console cache:clear --env=prod --no-debug

// Clearing the cache for the prod environment with debug false

[OK] Cache for the "prod" environment (debug=false) was successfully cleared.

==============

after few successful clicks on Login/Logout/Homepage I get again:

PHP Fatal error: Cannot redeclare class Symfony\Component\HttpFoundation\Response in /Users/User/Sites/symfony_demo/var/cache/prod/classes.php on line 3777
and
HP Fatal error: Cannot redeclare class Symfony\Component\HttpFoundation\ResponseHeaderBag in /var/www/symfony_demo/var/cache/prod/classes.php on line 4491

p.s.
macOS, Debian Linux, Chrome, Firefox is up-to-date

[RenWasHere]

Same issue in Symfony 3.2.1.

When viewing: /en/blog/

Fatal error: Cannot declare class Symfony\Component\HttpFoundation\ResponseHeaderBag, because the name is already in use in \var\cache\prod\classes.php on line 4491

Clearing the cache does fix it until you load another page.

PHP 7.0.10
Apache 2.4.23
MySQL 5.7.14
Windows 10 Pro

[bocharsky-bw]

I'm getting the same issue on PHP 7.0 and 7.1

[javiereguiluz]

I can't reproduce with latest Symfony Demo + Symfony 3.2.1 + PHP 7.1 + macOS.

Please, tell me the exact steps to reproduce it:

1. $ symfony demo
2. $ cd symfony_demo
3. php bin/console server:start
4. Browse 127.0.0.1:8000
5. ...

[bocharsky-bw]

@javiereguiluz It occurs for me only with the prod environment. My steps to reproduce are:

1. Clone repo (the latest master commit)
2. composer ins
3. bin/console s:r
4. rm -rf var/cache/*
5. Browser http://127.0.0.1:8000/app.php/
6. Press "Browser application"
7. Press "Symfony Demo"
8. Press "Browser application" again
9. If you don't see "Fatal error..." - repeat 6-8 steps

Anyway, for me, this error happens only with prod env on blog list page, i.e. when surfing Symfony Demo app and return to the http://127.0.0.1:8000/app.php/ru/blog/ page

[javiereguiluz]

@bocharsky-bw thanks! I could reproduce it now. They key for me was: use the prod environment and repeat the navigation several times until this error appears:

[bocharsky-bw]

Yeah, it happens randomly... sometimes I need to repeat the navigation several times too.

[maximivanov]

Doesn't seem to be PHP 7 specific issue. I can reproduce the problem following steps by bocharsky-bw with PHP 5.6.23, OS X, Symfony 3.2.1