Iconv implementation missing

[alsar]

The iconv extension is enabled, but there is no implementation available (like glibc). I tried with 7.2, 7.1 and 5.6 images.

The php.ini output:

iconv support => enabled
iconv implementation => unknown
iconv library version => unknown
iconv.input_encoding => no value => no value
iconv.internal_encoding => no value => no value
iconv.output_encoding => no value => no value

As a result the iconv() function fails with translit:
iconv('utf-8', 'ascii//TRANSLIT', 'test');

Notice: iconv(): Wrong charset, conversion from 'utf-8' to 'ascii//TRANSLIT' is not allowed

[csandanov]

Thanks for reporting this, the lib was really missing. The implementation and the version will still be missing despite the fix but you can validate that it's working now by running the following snippet in the container as suggested in docker-library/php#240 (comment)

php -d error_reporting=22527 -d display_errors=1 -r 'var_dump(iconv("UTF-8", "UTF-8//IGNORE", "This is the Euro symbol '\''€'\''."));'

If it runs without notices it's all good.

[alsar]

It works now. Thank you for the quick fix.

[alsar]

@csandanov The fix works with the CLI but not with FPM.

CLI environment variables from phpinfo():

LD_PRELOAD => /usr/lib/preloadable_libiconv.so php
$_SERVER['LD_PRELOAD'] => /usr/lib/preloadable_libiconv.so php
$_ENV['LD_PRELOAD'] => /usr/lib/preloadable_libiconv.so php

But those variables are missing when I output phpinfo() with FPM.

[csandanov]

Yes, that's because FPM has clear_env = yes by default. Added LD_PRELOAD to the list of env vars that always pass through.

[alsar]

I tried the updated image. The environment variables are now present, but the iconv function with translit still fails with FPM.

[csandanov]

Does it work if you set clear_env = yes and LD_PRELOAD=/usr/lib/preloadable_libiconv.so php-fpm?

[alsar]

No. The change is visible in php.ini, but it still works only for CLI but not FPM.

[csandanov]

Right, we run fpm via sudo. Added LD_PRELOAD directly to the command, my example from above now runs without notices via fpm as well.

[alsar]

It works now. Thanks.

Just a remark. On my local setup the command php -r "var_dump(iconv('UTF-8', 'ASCII//TRANSLIT', 'tést'));" outputs test, but with your image it's t'est.
Do you know maybe what is this related to? Locales maybe?

[csandanov]

What's your OS? AFAIK, Linux and Windows use different libs for iconv

[alsar]

I'm on Linux.
Ubuntu 16.04 with PHP 7.2.4 with glibc 2.23

[csandanov]

Could be docker-library/php#240 (comment)

[alsar]

Probably.

When I output setlocale(LC_ALL, 0); I get:
on my local installation: LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=C;LC_COLLATE=C;LC_MONETARY=C;LC_MESSAGES=C;LC_PAPER=C;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=C;LC_IDENTIFICATION=C

inside the container: C.UTF-8;C;C;C;C;C

[csandanov]

I doubt this issue can be resolved, most likely this caused due to usage of GNU iconv library and not having a good locale support in musl, try using http://php.net/manual/en/transliterator.transliterate.php instead for transliteration:

php -r 'var_dump(transliterator_transliterate("Any-Latin; Latin-ASCII; [\u0080-\u7fff] remove", "A æ Übérmensch på høyeste nivå! И я люблю PHP! есть. fi ¦"));'

[gsusI]

Fixed by installing php7-mbstring php7-iconv in that order

RUN apk --no-cache add php7-mbstring php7-iconv

Original solution here: docker-library/php#240 (comment)

[csandanov]

Fixed in the upstream docker-library/php#1264