PHP Composer Error - Cannot Redeclare Class

I rebuilt PHP last night to include APC and all of a sudden composer stopped working in my project. Whenever I ran a simple update, install or dump-autoload I’d get:

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$ composer update
PHP Fatal error:  include(): Cannot redeclare class symfony\component\process\process in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php on line 183

Fatal error: include(): Cannot redeclare class symfony\component\process\process in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php on line 183

A quick google told me others also had the same issue.

It seems that there’s a bug between composer.phar and APC. From one of the composer issues:

Quite weird, but then again the php docs seem to acknowledge that APC should not really be
enabled on the CLI. It seems to be a phar+apc bug, see https://bugs.php.net/bug.php?id=59398
https://bugs.php.net/bug.php?id=59829 https://bugs.php.net/bug.php?id=59907 as well.

There are a couple of things you can do to fix this, but they all involve turning off APC for php-cli. First, run composer diag to see whether any more information can be gleaned:

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$ composer diag
Checking platform settings: FAIL

The apc.enable_cli setting is incorrect.
Add the following to the end of your `php.ini`:
    apc.enable_cli = Off

The php.ini used by your command-line PHP is: /opt/php-5.4.15/lib/php.ini
If you can not modify the ini file, you can also run `php -d option=value` to modify ini values on the fly. You can use -d multiple times.

If you get that message, you know you have the same problem as I did :) You can also check the troubleshooting page on getcomposer.org

You can try running the self-update (for me I don’t reference the .phar file because I use the unix install convention).

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php /usr/local/bin/composer self-update

Those are really just everyday things to try if you have composer issues, to really fix this you need to disable APC for php-cli. You should set this option to 0 in your php.ini

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apc.enable_cli=0

If you don’t have access to php.ini, you can disable APC on the CLI per command:

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php -d apc.enable_cli=0 /usr/local/bin/composer install

Note: if you have composer.phar in your project you could just do:

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php -d apc.enable_cli=0 composer.phar install
php

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