PHP / Composer cannot redeclare

Question

I was happily working away in my development environment and suddenly I started getting the following error:

PHP Fatal error: Cannot redeclare composerRequire7a368ac394ae1d2e857becf2a235ebaa() (previously declared in [APP_ROOT]/vendor/composer/autoload_real.php:56) in [APP_ROOT]/vendor/composer/autoload_real.php on line 59

I haven't made any changes to speak of in composer dependencies (although I think I did do a composer update somewhere in that timeframe but no changes to the dependencies/packages used so nothing big should have changed.

Notably, when I checkout the repo on my laptop I do NOT get this error but if I git clone a clean repo and then composer install on my main development machine I DO get this error. So I'm assuming it must have some machine-specific origin but I'm running out of ideas on what that might be.

Any help would be greatly appreciated.

Note: I'm running PHP 5.3.28 on OSX; my app uses namespacing and is PSR0 compliant

---

Also of note is that I'm running PHPUnit 4.0.17 and the error is triggered at the very first stages of trying to run a unit test (it doesn't matter WHICH unit test). Here's the stack trace:

0.0009     636648   1. {main}() [APP_BASE]/vendor/phpunit/phpunit/phpunit:0
0.0465    1423664   2. PHPUnit_TextUI_Command::main() [APP_BASE]/vendor/phpunit/phpunit/phpunit:54
0.0465    1424280   3. PHPUnit_TextUI_Command->run() [APP_BASE]/vendor/phpunit/phpunit/src/TextUI/Command.php:132
0.0465    1424280   4. PHPUnit_TextUI_Command->handleArguments() [APP_BASE]/vendor/phpunit/phpunit/src/TextUI/Command.php:141
0.0674    2123344   5. PHPUnit_TextUI_Command->handleBootstrap() [APP_BASE]/vendor/phpunit/phpunit/src/TextUI/Command.php:638
0.0681    2139872   6. PHPUnit_Util_Fileloader::checkAndLoad() [APP_BASE]/vendor/phpunit/phpunit/src/TextUI/Command.php:808
0.0681    2140008   7. PHPUnit_Util_Fileloader::load() [APP_BASE]/vendor/phpunit/phpunit/src/Util/Fileloader.php:77
0.0774    2144176   8. include_once('[APP_BASE]/tests/test-loader.php') [APP_BASE]/vendor/phpunit/phpunit/src/Util/Fileloader.php:93
0.0775    2146736   9. include('[APP_BASE]/vendor/autoload.php') [APP_BASE]/tests/test-loader.php:2

Answer 1

Delete composer.lock and vendor/ and run composer update again.

Answer 2

I had this problem when I made a copy of an existing project directory and tried to run phpunit on the new directory. Finally figured out that when I executed phpunit, it was running out of the old directory. I ran this:

which phpunit

And saw that it was running from my composer vendor directory:

/home/vagrant/Code/MYOLDPROJECT/api/vendor/bin/phpunit

I ran phpunit from the new directory and the problem disappeared:

/home/vagrant/Code/mynewproject/api/vendor/bin/phpunit