The offical release of intl extension (http://pecl.php.net/package/intl) is written for PHP 5.2.x, but PHP 5.3.x had changed the zval struct, thus the intl extension cann't be compile under PHP 5.3.x. If you try to install this extension by PECL or PEAR, you will get an error like this:
/usr/temp/intl/collator/collator_class.c:92: error: duplicate ‘static’
/usr/temp/intl/collator/collator_class.c:96: error: duplicate ‘static’
/usr/temp/intl/collator/collator_class.c:101: error: duplicate ‘static’
/usr/temp/intl/collator/collator_class.c:107: error: duplicate ‘static’
make: *** [collator/collator_class.lo] Error 1
ERROR: `make' failed
This is a patched version can be compile with PHP 5.3.
WARNNING: THIS IS FOR TEST ONLY, USE AT YOUR OWN RISK
The native php5 build ships with Mac OS X 10.6 did not have intl extension enabled. As a result, people who want to use intl extension have to compile by themself.
If your want to give Symfony2 (http://symfony-reloaded.org/) a try, you will need this...
$ git clone git://github.com/liangzhenjing/php53-intl.git
$ cd php53-intl
$ phpize
$ ./configure
$ make && make install
NOT ALL THE TESTS PASSED, SO AGAIN, USE AT YOUR OWN RISK!
Test result:
=====================================================================
TEST RESULT SUMMARY
---------------------------------------------------------------------
Exts skipped : 0
Exts tested : 55
---------------------------------------------------------------------
Number of tests : 78 78
Tests skipped : 0 ( 0.0%) --------
Tests warned : 0 ( 0.0%) ( 0.0%)
Tests failed : 17 ( 21.8%) ( 21.8%)
Expected fail : 0 ( 0.0%) ( 0.0%)
Tests passed : 61 ( 78.2%) ( 78.2%)
---------------------------------------------------------------------
Time taken : 10 seconds
=====================================================================
=====================================================================
FAILED TEST SUMMARY
---------------------------------------------------------------------
get_locale() [tests/collator_get_locale.phpt]
collator_get_sort_key() [tests/collator_get_sort_key.phpt]
datefmt_get_pattern_code and datefmt_set_pattern_code() [tests/dateformat_get_set_pattern.phpt]
datefmt_localtime_code() [tests/dateformat_localtime.phpt]
datefmt_parse_code() [tests/dateformat_parse.phpt]
datefmt_parse_localtime() with parse pos [tests/dateformat_parse_localtime_parsepos.phpt]
datefmt_parse_timestamp_code() with parse pos [tests/dateformat_parse_timestamp_parsepos.phpt]
datefmt_set_timezone_id_code() [tests/dateformat_set_timezone_id.phpt]
numfmt_format() [tests/formatter_format.phpt]
numfmt_format_currency() [tests/formatter_format_currency.phpt]
grapheme() [tests/grapheme.phpt]
locale_get_display_name() [tests/locale_get_display_name.phpt]
locale_get_display_region() [tests/locale_get_display_region.phpt]
locale_get_display_script() [tests/locale_get_display_script.phpt]
locale_get_display_variant() [tests/locale_get_display_variant.phpt]
locale_get_region() [tests/locale_get_region.phpt]
locale_parse_locale() [tests/locale_parse_locale.phpt]
=====================================================================