It is an XMind file generator written in and designed for PHP, released as open source software library under MIT License.
Is this project the first to write XMind File in PHP?
composer require sinri/xmind-writer
The XMind file format used in this project is following the description provided in https://github.com/xmindltd/xmind/wiki/XMindFileFormat . It seems to be out-dated as XMind now released XMind 8 and XMind ZEN version, however, the old opened format should be still available in these new versions. XMind 7.x and XMind ZEN has been tested with free trail versions of them.
It is simple to use tools provided in tools, or use the raw XML entity implementation.
See test/samples and you would understand soon.