There appears to be a bug here, but I haven't been able to figure out a solution.

The phpunit tests pass.

If I run bin/console cac:cl -e=dev I'm seeing:

PHP Warning:  strpos(): Empty needle in /var/www/api.codereviewvideos.dev/vendor/symfony/symfony/src/Symfony/Component/Console/Input/ArgvInput.php on line 291
PHP Stack trace:
PHP   1. {main}() /var/www/api.codereviewvideos.dev/bin/console:0
PHP   2. Symfony\Component\Console\Input\ArgvInput->hasParameterOption() /var/www/api.codereviewvideos.dev/bin/console:21
PHP   3. strpos() /var/www/api.codereviewvideos.dev/vendor/symfony/symfony/src/Symfony/Component/Console/Input/ArgvInput.php:291

The bigger issue is:

In FileLocator.php line 44:

  The file "/var/www/api.codereviewvideos.dev/app/config/config_=dev.yml" does not exist.

The =dev bit being the problem.

I tracked this down to the change below in getParameterOption.

return substr($token, strlen($leading));

Looking at the old code:

return substr($token, $pos + 1);

If I change to:

return substr($token, strlen($leading) + 1);

Then the command completes - but the strpos warnings remain.

I added the following just before the new return on line 321:

\Doctrine\Common\Util\Debug::dump([
    'value' => $value,
    'token' => $token,
    '0 === strpos($value, "--")' => 0 === strpos($value, '--'),
    'leading' => $leading,
    'strlen($leading)' => strlen($leading),
    'substr($token, strlen($leading))' => substr($token, strlen($leading) + 1),
]);

If I e.g. run the cache:clear command again I see:

array (size=6)
  'value' => string '-e' (length=2)
  'token' => string '-e=dev' (length=6)
  '0 === strpos($value, "--")' => boolean false
  'leading' => string '-e' (length=2)
  'strlen($leading)' => int 2
  'substr($token, strlen($leading))' => string 'dev' (length=3)

Looks good.

Now if I run the tests I see 8 failures (provideGetParameterOptionValues) e.g:

8) Symfony\Component\Console\Tests\Input\ArgvInputTest::testGetParameterOptionEqualSign with data set #13 (array('app/console', 'foo:bar', '--', '--env=dev'), '--env', false, 'dev')
->getParameterOption() returns the expected value
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'dev'
+'ev'

One extra thing, this only affects the short options (-e=dev), using the longer form (--env=dev) does not trigger this issue. However, the strpos(): Empty needle issue occurs for both long and short form.

Sorry I haven't been able to figure this out, but I hope this helps in some way in tracking down the root cause. Thank you for your time.