transfer list in textarea to comma delimited string

[afan pasalic <afan@xxxxxxxx>]

hi,
I have one textarea field in a registration form where visitor enters
keywords. even there is a not next to the field "please enter keywords
as comma delimited string", they enter as  a list, below each other.

I tried to convert the list into comma delimited string with several
solutions but non of them works:
$keywords = eregi_replace('\n', '.', $keywords);
$keywords = eregi_replace('\r', '.', $keywords);
$keywords = eregi_replace('\n\r', '.', $keywords);
$keywords = eregi_replace('<br>', '.', $keywords);

any help here?

thanks

-afan


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