Description:
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Locale data contain important information about currency formatting in fields 
int_p_sep_by_space and int_n_sep_by_space.
C structure lconv contains such fields while PHP localeconv() doesn't return 
them.

I've attached a patch but it probably should also contain something like #IFDEF 
USE_ISOC99 (sorry, I am not a C developer)


Test script:
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set_locale(LC_MONETARY, 'en_US.UTF-8');
$lc = localeconv();
print $lc['int_p_sep_by_space'];

Expected result:
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1

Actual result:
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PHP Notice:  Undefined index: int_p_sep_by_space