+=head1 NAME
+
+PLP - Perl in HTML pages
+
+=head1 SYNOPSIS
+
+=head2 mod_perl installation
+
+=over 10
+
+=item * httpd.conf (for mod_perl setup)
+
+ <Files *.plp>
+ SetHandler perl-script
+ PerlHandler PLP
+ PerlSendHeader On
+ PerlSetVar PLPcache On
+ </Files>
+
+ # Who said CGI was easier to set up? :)
+
+=back
+
+=head2 CGI installation
+
+=over 10
+
+=item * /foo/bar/plp.cgi (local filesystem address)
+
+ #!/usr/bin/perl
+ use PLP;
+ PLP::everything();
+
+=item * httpd.conf (for CGI setup)
+
+ ScriptAlias /foo/bar/ /PLP_COMMON/
+ <Directory /foo/bar/>
+ AllowOverride None
+ Options +ExecCGI
+ Order allow,deny
+ Allow from all
+ </Directory>
+ AddHandler plp-document plp
+ Action plp-document /PLP_COMMON/plp.cgi
+
+=back
+
+=head2 Test script (test.plp)
+
+ <html><body>
+ <:
+ print "Hurrah, it works!<br>" for 1..10;
+ :>
+ </body></html>
+
+=head1 DESCRIPTION
+
+PLP is yet another Perl embedder, primarily for HTML documents. Unlike with
+other Perl embedders, there is no need to learn a meta-syntax or object
+model: one can just use the normal Perl constructs. PLP runs under mod_perl
+for speeds comparable to those of PHP, but can also be run as a CGI script.
+
+=head2 PLP Syntax
+
+=over 22
+
+=item C<< <: perl_code(); :> >>
+
+With C<< <: >> and C<< :> >>, you can add Perl code to your document. This is
+what PLP is all about. All code outside of these tags is printed. It is
+possible to mix perl language constructs with normal HTML parts of the document:
+
+ <: unless ($ENV{REMOTE_USER}) { :>
+ You are not logged in.
+ <: } :>
+
+C<< :> >> always stops a code block, even when it is found in a string literal.
+
+=item C<< <:= $expression :> >>
+
+Includes a dynamic expression in your document. The expression is evaluated in
+list context. Please note that the expression should not end a statement: avoid
+semi-colons. No whitespace may be between C<< <: >> and the equal sign.
+
+C<< foo <:= $bar :> $baz >> is like C<< <: print 'foo ', $bar, ' baz'; :> >>.
+
+=item C<< <(filename)> >>
+
+Includes another file before the PLP code is executed. The file is included
+literally, so it shares lexical variables. Because this is a compile-time tag,
+it's fast, but you can't use a variable as the filename. You can create
+recursive includes, so beware! (PLP will catch simple recursion: the maximum
+depth is 128.) Whitespace in the filename is not ignored so C<< <( foo.txt)> >>
+includes the file named C< foo.txt>, including the space in its name. A
+compile-time alternative is include(), which is described in L<PLP::Functions>.
+
+=back
+
+=head2 PLP Functions
+
+These are described in L<PLP::Functions>.
+
+=head2 PLP Variables
+
+=over 22
+
+=item $ENV{PLP_NAME}
+
+The URI of the PLP document, without the query string. (Example: C</foo.plp>)
+
+=item $ENV{PLP_FILENAME}
+
+The filename of the PLP document. (Example: C</var/www/index.plp>)
+
+=item $PLP::VERSION
+
+The version of PLP.
+
+=item $PLP::DEBUG
+
+Controls debugging output, and should be treated as a bitmask. The least
+significant bit (1) controls if run-time error messages are reported to the
+browser, the second bit (2) controls if headers are sent twice, so they get
+displayed in the browser. A value of 3 means both features are enabled. The
+default value is 1.
+
+=item $PLP::ERROR
+
+Contains a reference to the code that is used to report run-time errors. You
+can override this to have it in your own design, and you could even make it
+report errors by e-mail. The sub reference gets two arguments: the error message
+as plain text and the error message with special characters encoded with HTML
+entities.
+
+=item %header, %cookie, %get, %post, %fields
+
+These are described in L<PLP::Fields>.
+
+=back
+
+=head2 (mod_perl only) PerlSetVar configuration directives
+
+=over 22
+
+=item PLPcache
+
+Sets caching B<On>/B<Off>. When caching, PLP saves your script in memory and
+doesn't re-read and re-parse it if it hasn't changed. PLP will use more memory,
+but will also run 50% faster.
+
+B<On> is default, anything that isn't =~ /^off$/i is considered On.
+
+=back
+
+=head2 Things that you should know about
+
+Not only syntax is important, you should also be aware of some other important
+features. Your script runs inside the package C<PLP::Script> and shouldn't
+leave it. This is because when your script ends, all global variables in the
+C<PLP::Script> package are destroyed, which is very important if you run under
+mod_perl (they would retain their values if they weren't explicitly destroyed).
+
+Until your first output, you are printing to a tied filehandle C<PLPOUT>. On
+first output, headers are sent to the browser and C<STDOUT> is selected for
+efficiency. To set headers, you must assign to C<$header{ $header_name}> before
+any output. This means the opening C<< <: >> have to be the first characters in
+your document, without any whitespace in front of them. If you start output and
+try to set headers later, an error message will appear telling you on which
+line your output started. An alternative way of setting headers is using Perl's
+BEGIN blocks. BEGIN blocks are executed as soon as possible, before anything
+else.
+
+Because the interpreter that mod_perl uses never ends, C<END { }> blocks won't
+work properly. You should use C<PLP_END { };> instead. Note that this is a not
+a built-in construct, so it needs proper termination with a semi-colon (as do
+<eval> and <do>).
+
+Under mod_perl, modules are loaded only once. A good modular design can improve
+performance because of this, but you will have to B<reload> the modules
+yourself when there are newer versions.
+
+The special hashes are tied hashes and do not always behave the way you expect,
+especially when mixed with modules that expect normal CGI environments, like
+CGI.pm. Read L<PLP::Fields> for information more about this.
+
+=head1 FAQ and HowTo
+
+A lot of questions are asked often, so before asking yours, please read the
+FAQ at L<PLP::FAQ>. Some examples can be found at L<PLP::HowTo>.
+
+=head1 NO WARRANTY
+
+No warranty, no guarantees. Use PLP at your own risk, as I disclaim all
+responsibility.
+
+=head1 AUTHORS
+
+Currently maintained by Mischa POSLAWSKY <perl@shiar.org>
+
+Originally by Juerd Waalboer <juerd@cpan.org>
+
+=head1 SEE ALSO
+
+L<PLP::Functions>, L<PLP::Fields>, L<PLP::FAQ>, L<PLP::HowTo>
+
+=cut
+
+### Garbage bin
+
+# About the #S lines:
+# I wanted to implement Safe.pm so that scripts were run inside a
+# configurable compartment. This needed for XS modules to be pre-loaded,
+# hence the PLPsafe_* Apache directives. However, $safe->reval() lets
+# Apache segfault. End of fun. The lines are still here so that I can
+# s/^#S //g to re-implement them whenever this has been fixed.
+
+#S # For PLPsafe scripts
+#S sub safe_eval {
+#S my ($r, $code) = @_;
+#S $r->send_http_header('text/plain');
+#S require Safe;
+#S unless ($PLP::safe) {
+#S $PLP::safe = Safe->new('PLP::Script');
+#S for ( map split, $r->dir_config->get('PLPsafe_module') ) {
+#S $PLP::safe->share('*' . $_ . '::');
+#S s!::!/!g;
+#S require $_ . '.pm';
+#S }
+#S $PLP::safe->permit(Opcode::full_opset());
+#S $PLP::safe->deny(Opcode::opset(':dangerous'));
+#S }
+#S $PLP::safe->reval($code);
+#S }
+#S my ($r) = @_;
+
+# start()
+#S if ($PLP::use_safe) {
+#S PLP::safe_eval($r, $PLP::code);
+#S } else {
+# eval qq{ package PLP::Script; $PLP::code; };
+#S }
+# PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
+#S if ($PLP::use_safe) {
+#S PLP::safe_eval($r, '$_->() for reverse @PLP::END');
+#S } else {
+# eval { package PLP::Script; $_->() for reverse @PLP::END };
+#S }
+# PLP::error($@, 1) if $@ and $@ !~ /\cS\cT\cO\cP/;
+
+###