Laravel – PHP does not print any errors or output (for example for php artisan) on WolfiOS

I am trying to debug a WolfiOS docker image with an Laravel app.

php artisan does not print out anything (normally it would display the usage help)

/var/www/html # php -d "display_errors=On" -d "display_startup_errors=On" artisan
/var/www/html # 

In my INI, display_errors is currently off, that is why I am activating it via -d and it the setting’s a picked up:

/var/www/html # php -d "display_errors=On" -d "display_startup_errors=On" -i |grep error
display_errors => STDOUT => STDOUT
display_startup_errors => On => On
error_append_string => no value => no value
error_log => /var/log/php_error.log => /var/log/php_error.log
error_prepend_string => no value => no value
error_reporting => E_ALL => E_ALL
html_errors => Off => Off
ignore_repeated_errors => Off => Off
log_errors => On => On
xmlrpc_error_number => 0 => 0
xmlrpc_errors => Off => Off
intl.error_level => 0 => 0

So even when I tried enabling error reporting, nothing is printed.

What can be the cause?
I would expect an error to be printed, if something went wrong.

EDIT:

Last useful thing I see, when prepending strace is something about a ContainerException:

openat(AT_FDCWD, "/var/www/html/vendor/psr/container/src/ContainerExceptionInterface.php", O_RDONLY) = 4

I am more interested in why no error is printed, than what could be the cause, from there I will figure it out.

EDIT2:

I now also changed in the ini:

expose_php = Off
error_reporting = ${PHP_ERROR_REPORTING}
display_errors = On
display_startup_errors = On

and verified:

/var/www/html # php -i |grep error
display_errors => STDOUT => STDOUT
display_startup_errors => On => On
error_append_string => no value => no value
error_log => /var/log/php_error.log => /var/log/php_error.log
error_prepend_string => no value => no value
error_reporting => E_ALL => E_ALL
html_errors => Off => Off
ignore_repeated_errors => Off => Off
log_errors => On => On
xmlrpc_error_number => 0 => 0
xmlrpc_errors => Off => Off
intl.error_level => 0 => 0

I created a smaller example with an error – no output still:

/var/www/html # cat error.php 
<?php

echo "teststring
/var/www/html # php error.php 
/var/www/html # 

EDIT3:

I was asked, if STDOUT is even working correctly – it is:

/var/www/html # cat noerror.php 
<?php

echo "no error" . PHP_EOL;
/var/www/html # php noerror.php 
no error