Our OJS 2.4.7 works correctly on php 5.6 but it does not work on php 7.2. When we switch php5.6 to php 7.2 a blank page appears.
Now we want to upgrade OJS 2.4.7 to OJS 3.x. We want to do that by creating parallel sandbox copy. What I found however is that OJS 3.1 works on php 7.2 only. So our problem is that if we want to create this sandbox copy we need to configure php 7.2 but then our old OJS 2.4.7 won’t work.
How can we overcome this problem? Another words, what is the most recent OJS 3.x version which can be created on php 5.6 and then later configured to php 7.2? Or you can suggest any other solution?