Symfony 2 no toma cambios en parameters.yml

Supongamos que queremos cambiar el host de la base de datos porque migramos de hosting. Lo cambiamos alegremente en parameters.yml, pero sigue dando el error "Connection timed out".

La solución es borrar la cache, pero si no se tiene acceso directo al servidor, hacerlo por FTP puede demorar una eternidad. La solución en mi caso fue borrar sólo el archivo app/cache/prod/appProdProjectContainer.php, donde aparentemente Symfony 2 cachea los parámetros.

Quiero agradecer cordialmente a la función debug_print_backtrace() de PHP. Si la usan, asegúrense de invocarla con el flag DEBUG_BACKTRACE_IGNORE_ARGS, o les va a salir un choclo ilegible.

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