Description:
------------
Under IBM AIX, using the IBM-shipped version of libiconv (package bos.rte.iconv) requires one to use "ISO8859-1" instead of "ISO-8859-1" in the call to iconv() when dealing with ISO latin-1 character set conversions.

Probably one should set iconv.input_encoding, iconv.internal_encoding and iconv.output_encoding to "ISO8859-1" as well, in php.ini or the Apache server configuration (to override the default values of "ISO-8859-1").

Other similar cases seem to be present, see:
http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/genprogc/convert_prg.htm#HDRDNNRI49HOWA

This may be worth to point out in the PHP iconv documentation:
http://www.php.net/iconv

Furthermore, this may very well be the cause for the iconv tests failing under AIX.


Reproduce code:
---------------
The package origin of the libiconv.a file is given by:

$ lslpp -w /usr/lib/libiconv.a 
  File                                        Fileset               Type
  ----------------------------------------------------------------------------
  /usr/lib/libiconv.a                         bos.rte.iconv         File


Version information is given by:

$ lslpp -la | grep iconv
  bos.iconv.com              5.2.0.0  COMMITTED  Common Language to Language
  bos.iconv.ucs.com          5.2.0.0  COMMITTED  Unicode Base Converters for
  bos.rte.iconv              5.2.0.0  COMMITTED  Language Converters


Working PHP code for translating some Swedish characters in character set ISO8859-1 to UTF-8:

<?php
  if (function_exists('iconv')) {
                                $namn = iconv('ISO8859-1', 'UTF-8', "åäö");
                                echo "Result: $namn";
  }
?>

Using "ISO-8859-1" does not work!


Excerpt from 'make test':

=====================================================================
FAILED TEST SUMMARY
---------------------------------------------------------------------

/../

iconv() test 1 [ext/iconv/tests/iconv001.phpt]
iconv_mime_encode() sanity cheeck. [ext/iconv/tests/iconv004.phpt]
iconv_mime_decode() [ext/iconv/tests/iconv_mime_decode.phpt]
iconv_mime_decode_headers() [ext/iconv/tests/iconv_mime_decode_headers.phpt]
iconv_mime_encode() [ext/iconv/tests/iconv_mime_encode.phpt]
iconv stream filter [ext/iconv/tests/iconv_stream_filter.phpt]
iconv_strlen() [ext/iconv/tests/iconv_strlen.phpt]
iconv_strpos() [ext/iconv/tests/iconv_strpos.phpt]
iconv_strrpos() [ext/iconv/tests/iconv_strrpos.phpt]
iconv_substr() [ext/iconv/tests/iconv_substr.phpt]

/../

Actual result:
--------------
iconv() returning FALSE when the conversion fails (due to "incorrect" encoding specified).