As already reported in Tutorials section comments:
A full working (but inofficially) update for PHPFusion 7.02.07 is available at german NSS:
Link This package provides PDO and MySQLi support. The whole core is updated to run under php 5.3 - 7.1
The update is mostly limited to stay compatible to 7.02.07
New features are: tinymce v4 instead v3, Grecaptcha v2 instead of v1, color chooser for tinymce editor background, filemanager for tinymce.
All unassigned arrays, class constructors, db functions and other deprecated codes are fixed.
This package includes a subfolder "update_only" to update existing Fusion 7 websites and a subfolder "full" for full installation.
During installation routine you can choose between pdo and mysqli.
If you only update existing websites you have to add a new line in config.php:
(if you prefer mysqli then replace "pdo" with "mysqli")
This update is for users who wants to wait before upgrading to Fusion 9 but having problems to run under newer php versions. Problems occuring at php 5.6 and higher.