Uncaught Error: Call to undefined function Laravel\Installer\Console\mb_rtrim()

[didix16]

Installer Version

5.11.0

Description

I'm on Windows 11 machine using 8.2 PHP version.
While trying to install Laravel using the installer, after choosing the testing framework I've got an exception.

PHP Fatal error:  Uncaught Error: Call to undefined function Laravel\Installer\Console\mb_rtrim() in C:\Users\User\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php:162
Stack trace:
#0 C:\Users\User\AppData\Roaming\Composer\vendor\symfony\console\Command\Command.php(279): Laravel\Installer\Console\NewCommand->execute()
#1 C:\Users\User\AppData\Roaming\Composer\vendor\symfony\console\Application.php(1029): Symfony\Component\Console\Command\Command->run()
#2 C:\Users\User\AppData\Roaming\Composer\vendor\symfony\console\Application.php(316): Symfony\Component\Console\Application->doRunCommand()
#3 C:\Users\User\AppData\Roaming\Composer\vendor\symfony\console\Application.php(167): Symfony\Component\Console\Application->doRun()
#4 C:\Users\User\AppData\Roaming\Composer\vendor\laravel\installer\bin\laravel(13): Symfony\Component\Console\Application->run()
#5 C:\Users\User\AppData\Roaming\Composer\vendor\bin\laravel(119): include('...')
#6 {main}
  thrown in C:\Users\User\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php on line 162

Steps To Reproduce

$ laravel new test-app

 Would you like to install a starter kit? [No starter kit]:
  [none     ] No starter kit
  [breeze   ] Laravel Breeze
  [jetstream] Laravel Jetstream
 > breeze


 Which Breeze stack would you like to install? [Blade with Alpine]:
  [blade              ] Blade with Alpine
  [livewire           ] Livewire (Volt Class API) with Alpine
  [livewire-functional] Livewire (Volt Functional API) with Alpine
  [react              ] React with Inertia
  [vue                ] Vue with Inertia
  [api                ] API only
 > react


 Would you like any optional features? [None]:
  [none      ] None
  [dark      ] Dark mode
  [ssr       ] Inertia SSR
  [typescript] TypeScript
  [eslint    ] ESLint with Prettier
 > typescript,dark


 Which testing framework do you prefer? [Pest]:
  [0] Pest
  [1] PHPUnit
 >

PHP Fatal error:  Uncaught Error: Call to undefined function Laravel\Installer\Console\mb_rtrim() in C:\Users\User\AppData\Roaming\Composer\vendor\laravel\installer\src\NewCommand.php:162
...

[crynobone]

@didix16 Thanks for the report. It seems like your installation missing mbstring extension or PHP 8.4

To solve this without waiting for a new installer release you should be able to run the following:

composer global require symfony/polyfill-mbstring

[didix16]

Thanks for you fast response @crynobone !

[crynobone]

@didix16 After looking deeper into this, it seems that Laravel Framework does require mbstring extension and your installation would still failed: https://laravel.com/docs/11.x/deployment#server-requirements

[didix16]

@crynobone I've had already activated the mbstring extension. I had it since I was installed the PHP 8.2 version. I just installed the symfony/polyfill-mbstring package globally and worked like a charm. Thanks!