need more explanation on the second arguement in open

greatshots has asked for the wisdom of the Perl Monks concerning the following question:

open(my $fh, "<:utf8", "foo.html") || die;
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I have no Idea on the second arguement which is given in the open function. I read that line from HTML::Parser
what does that second argument do in open function?
what is the meaning of using ":utf8"?

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Re: need more explanation on the second arguement in open
by imp (Priest) on Oct 20, 2006 at 02:28 UTC

open

You may use the three-argument form of open to specify IO "layers" (sometimes also referred to as "disciplines") to be applied to the handle that affect how the input and output are processed (see open and PerlIO for more details). For example
open(FH, "<:utf8", "file")
will open the UTF-8 encoded file containing Unicode characters, see perluniintro. Note that if layers are specified in the three-arg form then default layers stored in ${^OPEN} (see perlvar; usually set by the open pragma or the switch -CioD) are ignored.

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Re: need more explanation on the second arguement in open
by grep (Monsignor) on Oct 20, 2006 at 02:35 UTC

docs

It explains:
open(FH, "<:utf8", "file") will open the UTF-8 encoded file containing Unicode characters.

If you've never dealt with Unicode before it says: see perluniintro

grep

One dead unjugged rabbit fish later

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Re: need more explanation on the second arguement in open
by Hofmator (Curate) on Oct 20, 2006 at 08:51 UTC

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