public function getContent()
{
return 'With the yaml config file you can do the following things:
* Add custom virtual variants feature
* Add presets of extensions
# YAML configuration file
The yaml configuration file can be set by using the following command:
```sh
phpbrew init -c=config.yaml
```
or alternatively:
```sh
phpbrew init --config=config.yaml
```
```yaml
variants:
dev:
bcmath:
bz2:
calendar:
cli:
ctype:
dom:
fileinfo:
filter:
ipc:
json:
mbregex:
mbstring:
mhash:
mcrypt:
gd:
- --with-libdir=lib/x86_64-linux-gnu
- --with-gd=shared
- --enable-gd-natf
- --with-jpeg-dir=/usr
- --with-png-dir=/usr
extensions:
dev:
xhprof: latest
xdebug: stable
```
# Custom virtual variants feature
The virtual variants are defined in the config file (see _variants_ in the config example above) and can overwrite the default configuration of the features (see _gd_ in the config example above), these config is only used if you call the custom virtual variant.
# Presets of extensions
Similar to the virtual variants you can define virtual extensions (see _extenions_ in the config example above). You can set also the version of the module.
The can be called by using the following command: _phpbrew ext install +dev_';
}