FuelPHPのアプリをPlack上で動作させる ref: http://qiita.com/uchiko/items/76e06b27438cbec1f818

app.psgi

use Plack::App::CGIBin;
use Plack::App::PHPCGI;
use Plack::Builder;
use File::Zglob;

my $DOCROOT = 'public';
my $php_cgi = '';

$php_cgi ||= `which php-cgi`;
chomp($php_cgi);

my $static = Plack::App::File->new(root => $DOCROOT)->to_app;

my @php;
for my $php ( zglob("$DOCROOT/*.php") ) {
    my $mount = $php;
    $mount =~ s!^$DOCROOT!!;
    my $app = Plack::App::PHPCGI->new(
        script  => $php,
        php_cgi => $php_cgi,
    )->to_app;
    push @php, [$mount,$app];
}

builder {
    enable 'ReverseProxy';
    enable sub {
        my $app = shift;
        sub {
            my $env = shift;
            $env->{REMOTE_USER} = 'php';
            $env->{PATH_INFO} = '/' . 'index.php/' .  $1
                if $env->{PATH_INFO} =~ m|^/([^\.]+)*$|;
            $env->{FUEL_ENV} = $ENV{FUEL_ENV} || 'development';
            $app->($env);
        };
    };
    for my $php ( @php ) {
        mount $php->[0], $php->[1];
    }
    mount '/' => $static,
};

cpanfile

requires 'Plack';
requires 'Plack::App::CGIBin';
requires 'Plack::App::PHPCGI';
requires 'File::Zglob';
requires 'CGI::Compile';
requires 'Plack::Middleware::ReverseProxy';

file1.txt

$ plackup app.psgi # developmentモード
$ FUEL_ENV=production plackup app.psgi # productionモード