Proper iconv

[davidsteinsland]

iconv is not working as expected on a vanilla php image. The solution is to install GNUs libiconv:
https://ftp.gnu.org/pub/gnu/libiconv/
... and linking this with php during configure process, or give the GNU library precedence:

ENV LD_PRELOAD /usr/local/lib/preloadable_libiconv.so

In any case, this script should not produce errors (as it does on current php images):

ini_set('display_errors', '1');
error_reporting(-1);

// should NOT produce:
// iconv(): Wrong charset, conversion from `UTF-8' to `ASCII//TRANSLIT' is not allowed in [...]
iconv("UTF-8", "ASCII//TRANSLIT", "foobar");

Current work-around:

RUN rm /usr/bin/iconv \
  && curl -SL http:https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz | tar -xz -C . \
  && cd libiconv-1.14 \
  && ./configure --prefix=/usr/local \
  && curl -SL https://raw.githubusercontent.com/mxe/mxe/7e231efd245996b886b501dad780761205ecf376/src/libiconv-1-fixes.patch \
  | patch -p1 -u  \
  && make \
  && make install \
  && libtool --finish /usr/local/lib \
  && cd .. \
  && rm -rf libiconv-1.14

ENV LD_PRELOAD /usr/local/lib/preloadable_libiconv.so

[ncopa]

Technically the musl behavior is correct according POSIX as explained in related issue: akrennmair/newsbeuter#364 (comment)

[Flowman]

This workaround works fine in alpine 3.3 but if I try to compile php on 3.5 I get this error. Same docker file but changed the version.

ext/gd/libgd/.libs/gdkanji.o: In function `do_convert':
/tmp/php/ext/gd/libgd/gdkanji.c:349: undefined reference to `libiconv_open'
/tmp/php/ext/gd/libgd/gdkanji.c:364: undefined reference to `libiconv'
/tmp/php/ext/gd/libgd/gdkanji.c:380: undefined reference to `libiconv_close'
ext/iconv/.libs/iconv.o: In function `php_iconv_stream_filter_dtor':
/tmp/php/ext/iconv/iconv.c:2565: undefined reference to `libiconv_close'
ext/iconv/.libs/iconv.o: In function `php_iconv_stream_filter_ctor':
/tmp/php/ext/iconv/iconv.c:2591: undefined reference to `libiconv_open'
ext/iconv/.libs/iconv.o: In function `_php_iconv_strlen':
/tmp/php/ext/iconv/iconv.c:754: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:778: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:812: undefined reference to `libiconv_close'
ext/iconv/.libs/iconv.o: In function `_php_iconv_appendl':
/tmp/php/ext/iconv/iconv.c:474: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:508: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o: In function `_php_iconv_mime_decode':
/tmp/php/ext/iconv/iconv.c:1504: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:1997: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:2000: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:1615: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:1618: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:1615: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:1618: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:1618: undefined reference to `libiconv_open'
ext/iconv/.libs/iconv.o: In function `php_iconv_stream_filter_append_bucket':
/tmp/php/ext/iconv/iconv.c:2716: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:2637: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:2715: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o: In function `_php_iconv_substr':
/tmp/php/ext/iconv/iconv.c:875: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:899: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:954: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:958: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:907: undefined reference to `libiconv_open'
ext/iconv/.libs/iconv.o: In function `_php_iconv_mime_encode':
/tmp/php/ext/iconv/iconv.c:1193: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:1207: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:1378: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:1410: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:1466: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:1469: undefined reference to `libiconv_close'
/tmp/php/ext/iconv/iconv.c:1453: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:1325: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:1277: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:1309: undefined reference to `libiconv'
ext/iconv/.libs/iconv.o: In function `php_iconv_string':
/tmp/php/ext/iconv/iconv.c:578: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:590: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:608: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:618: undefined reference to `libiconv_close'
ext/iconv/.libs/iconv.o: In function `_php_iconv_strpos':
/tmp/php/ext/iconv/iconv.c:1002: undefined reference to `libiconv_open'
/tmp/php/ext/iconv/iconv.c:1030: undefined reference to `libiconv'
/tmp/php/ext/iconv/iconv.c:1144: undefined reference to `libiconv_close'
collect2: error: ld returned 1 exit status
make: *** [Makefile:281: sapi/cli/php] Error 1

Any magic I'm missing?

[kabudu]

I came across this gist which may help! (adjust for your version of PHP)

https://gist.github.com/guillemcanal/be3db96d3caa315b4e2b8259cab7d07e

[alexanderilyin]

A little bit cleaner hack:

RUN apk add --no-cache --repository http:https://dl-3.alpinelinux.org/alpine/edge/testing gnu-libiconv
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so

Test case:

php -d error_reporting=22527 -d display_errors=1 -r 'var_dump(iconv("UTF-8", "UTF-8//IGNORE", "This is the Euro symbol '\''€'\''."));'
Notice: iconv(): Wrong charset, conversion from `UTF-8' to `UTF-8//IGNORE' is not allowed in Command line code on line 1

If you don't get this notice it means it works as expected.

[delmicio]

@alexanderilyin should that code fix this issue? I can't make it work.

This is my dockerfile

RUN apk add -U --no-cache \
    autoconf \
    imap-dev \
    libxml2-dev \
    libpng-dev \
    alpine-sdk \
    mariadb-dev \
    zlib-dev \
    libxslt-dev \
    libjpeg-turbo-dev \
    libmcrypt-dev \
    icu-dev \
    gettext-dev \
    && docker-php-ext-configure gd --with-png-dir=/usr --with-jpeg-dir=/usr/include \
    && docker-php-ext-configure intl --enable-intl \
    && docker-php-ext-configure imap --with-imap --with-imap-ssl \
    && docker-php-ext-install \
        calendar \
        mysql \
        mysqli \
        bcmath \
        soap \
        xsl \
        gd \
        mbstring \
        pdo \
        pdo_mysql \
        zip \
        exif \
        mcrypt \
        intl \
        gettext \
        imap \
        iconv \
    && pecl install timezonedb \
    && docker-php-ext-enable timezonedb \
    && apk del --purge autoconf alpine-sdk mariadb-dev \
    && apk add -U mariadb-client-libs \
    && cd /usr/local/bin \
    && curl -sS https://getcomposer.org/installer | php \
    && mv composer.phar composer \
    && rm -rf /var/cache/apk/*

RUN apk add --no-cache --repository http:https://dl-3.alpinelinux.org/alpine/edge/testing gnu-libiconv
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php

[kabudu]

@delmicio iconv works fully (transliteration included) with this hack, even though it registers as "unknown" in the phpinfo() output.

[alexanderilyin]

@delmicio here is a "test case":

php -d error_reporting=22527 -d display_errors=1 -r 'var_dump(iconv("UTF-8", "UTF-8//IGNORE", "This is the Euro symbol '\''€'\''."));'
Notice: iconv(): Wrong charset, conversion from `UTF-8' to `UTF-8//IGNORE' is not allowed in Command line code on line 1

If you don't get this notice it means it works as expected.

[delmicio]

@alexanderilyin yes it's working with your code, although the version keeps unknown. A mystery.

[npulidom]

@alexanderilyin solution works great. Tested also with repository http:https://dl-4.alpinelinux.org/alpine/edge/testing

[ababushkin]

Confirmed that @alexanderilyin solution works. I altered the URL to be based off a CDN link instead:

RUN apk add gnu-libiconv --update-cache --repository http:https://dl-cdn.alpinelinux.org/alpine/edge/testing/ --allow-untrusted
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php

[tianon]

This appears to be a quirk of PHP when used with musl, and as noted by ncopa above, is POSIX compliant.

Given that and that this thread documents at least one reasonable workaround for folks for whom the default behavior is unacceptable, I'm going to close. Additionally, I imagine using the Debian variants of the image would likely also work. Thanks! ❤️

[vladkras]

In my case it was fixed with by installing php7-mbstring first, then php7-iconv.
I'm not sure if my symfony app uses iconv polyfill, but same error was solved

PS
alpine:3.7
php 7.1.12
symfony 4.0

PSS
Exactly same problem and same fix but Laravel and CentOS

[elkbullwinkle]

Just bumped into this on php7.4-fpm, running apk add --no-cache --repository http:https://dl-cdn.alpinelinux.org/alpine/edge/community/ --allow-untrusted gnu-libiconv does not create /usr/lib/preloadable_libiconv.so anymore. However if you do pin the library version to 1.15-r3 as described by @joepagan it works. Thanks for the workaround.

[CybotTM]

PHP (8) has to be built with ./configure --with-iconv=/usr/local after GNU Iconv packages have been installed.

[gsusI]

In case someone lands here, facing the Wrong charset issue and wants a built-in solution, rather than to compile the modules, you can do this by installing php7-mbstring php7-iconv in that order.

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

Original solution here: #240 (comment)

Edit: @rufinus, I edited my comment, as I believe it will still be helpful for people landing on this thread.

[rufinus]

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

thats no solution - u just use the module from alpine. this thread is about compiling modules and using official php container.

[tianon]

If you're going to apk add any PHP package, then FROM php isn't right -- you want FROM alpine instead (since apk add php7* will install Alpine's PHP build, and you don't want two different likely-incompatible copies of PHP).

[tianon]

FYI, #1264 implements upstream's recommendation from https://www.php.net/manual/en/intro.iconv.php to use GNU libiconv instead.