Configuration

FrankenPHP, Caddy as well the Mercure and Vulcain modules can be configured using the formats supported by Caddy.

In the Docker image, the Caddyfile is located at /etc/caddy/Caddyfile.

You can also configure PHP using php.ini as usual.

In the Docker image, the php.ini file is not present, you can create it or COPY manually.

If you copy php.ini from $PHP_INI_DIR/php.ini-production or $PHP_INI_DIR/php.ini-development you also must set variable variables_order = "EGPCS", because default value for variables_order is "EGPCS" but in php.ini-production and php.ini-development we have "GPCS". And in this case worker not work propertly.

FROM dunglas/frankenphp

RUN cp $PHP_INI_DIR/php.ini-production $PHP_INI_DIR/php.ini; \
    sed -i 's/variables_order = "GPCS"/variables_order = "EGPCS"/' $PHP_INI_DIR/php.ini;

Caddy Directives

To register the FrankenPHP executor, the frankenphp directive must be set in Caddy global options, then the php_server or the php HTTP directives must be set under routes serving PHP scripts.

Minimal example:

{
    # Enable FrankenPHP
    frankenphp
    # Configure when the directive must be executed
    order php_server before file_server
}

localhost {
    # Enable compression (optional)
    encode zstd gzip
    # Execute PHP files in the current directory and serve assets
    php_server
}

Optionally, the number of threads to create and worker scripts to start with the server can be specified under the global directive.

{
    frankenphp {
        num_threads <num_threads> # Sets the number of PHP threads to start. Default: 2x the number of available CPUs.
        worker {
            file <path> # Sets the path to the worker script.
            num <num> # Sets the number of PHP threads to start, defaults to 2x the number of available CPUs.
            env <key> <value> # Sets an extra environment variable to the given value. Can be specified more than once for multiple environment variables.
        }
    }
}

# ...

Alternatively, the short form of the worker directive can also be used:

{
    frankenphp {
        worker <file> <num>
    }
}

# ...

You can also define multiple workers if you serve multiple apps on the same server:

{
    frankenphp {
        worker /path/to/app/public/index.php <num>
        worker /path/to/other/public/index.php <num>
    }
}

app.example.com {
    root /path/to/app/public/
}


other.example.com {
    root /path/to/other/public/
}
...

Using the php_server directive is generaly what you need, but if you need full control, you can use the lower level php directive:

Using the php_server directive is equivalent to this configuration:

# Add trailing slash for directory requests
@canonicalPath {
    file {path}/index.php
    not path */
}
redir @canonicalPath {path}/ 308
# If the requested file does not exist, try index files
@indexFiles file {
    try_files {path} {path}/index.php index.php
    split_path .php
}
rewrite @indexFiles {http.matchers.file.relative}
# FrankenPHP!
@phpFiles path *.php
php @phpFiles
file_server

The php_server and the php directives have the following options:

php_server [<matcher>] {
    root <directory> # Sets the root folder to the site. Default: `root` directive.
    split_path <delim...> # Sets the substrings for splitting the URI into two parts. The first matching substring will be used to split the "path info" from the path. The first piece is suffixed with the matching substring and will be assumed as the actual resource (CGI script) name. The second piece will be set to PATH_INFO for the CGI script to use. Default: `.php`
    resolve_root_symlink # Enables resolving the `root` directory to its actual value by evaluating a symbolic link, if one exists.
    env <key> <value> # Sets an extra environment variable to the given value. Can be specified more than once for multiple environment variables.
}

Environment Variables

The following environment variables can be used to inject Caddy directives in the Caddyfile without modifying it:

SERVER_NAME change the server name
CADDY_GLOBAL_OPTIONS: inject global options
FRANKENPHP_CONFIG: inject config under the frankenphp directive

Unlike with FPM and CLI SAPIs, environment variables are not exposed by default in superglobals $_SERVER and $_ENV.

To propagate environment variables to $_SERVER and $_ENV, set the php.ini variables_order directive to EGPS.

Enable the Debug Mode

When using the Docker image, set the CADDY_DEBUG environment variable to debug to enable the debug mode:

docker run -v $PWD:/app/public \
    -e CADDY_GLOBAL_OPTIONS=debug \
    -p 80:80 -p 443:443 \
    dunglas/frankenphp