Fails "php artisan up" : Call to undefined function splitStringByWidth

$ php artisan up fails.

$ bx cf ssh $APP_NAME
> cd app
> ./php/bin/php artisan up
Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Console\mb_detect_encoding() in /home/vcap/app/vendor/symfony/console/Application.php:1121
Stack trace:
#0 /home/vcap/app/vendor/symfony/console/Application.php(780): Symfony\Component\Console\Application->splitStringByWidth('Call to undefin...', 145)
#1 /home/vcap/app/vendor/symfony/console/Application.php(750): Symfony\Component\Console\Application->doRenderException(Object(Symfony\Component\Debug\Exception\FatalThrowableError), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 /home/vcap/app/vendor/graham-campbell/exceptions/src/ExceptionHandler.php(134): Symfony\Component\Console\Application->renderException(Object(Symfony\Component\Debug\Exception\FatalThrowableError), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 /home/vcap/app/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(365): GrahamCampbell\Exceptions\ExceptionHandler->renderForConsole(Object(Symfony\Component\Console\Output\ConsoleOutput), Obje in /home/vcap/app/vendor/symfony/console/Application.php on line 1121

$ vi /home/vcap/app/vendor/symfony/console/Application.php
private function splitStringByWidth($string, $width)
    {
        // str_split is not suitable for multi-byte characters, we should use preg_split to get char array properly.
        // additionally, array_slice() is not enough as some character has doubled width.
        // we need a function to split string not by character count but by string width
        if (false === $encoding = mb_detect_encoding($string, null, true)) {
            return str_split($string, $width);
        }

https://github.com/cloudfoundry/php-buildpack/issues/293 , https://github.com/cloudfoundry/php-buildpack/issues/294

[dmikusa]

If that still doesn’t work, put together a demo/sample where it’s failing and I’ll take a look.

[dmikusa]

Sorry, my fault. You need to run HOME=/home/vcap/app source app/.profile.d/finalize_bp_env_vars.sh. CF sets HOME to the app root, but when you cf ssh home is the normal user home directory, not the app directory.