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Hei, what version for mybb is ok for php 5.4?

You should upgrade your php version and install the latest version as it's the most secure. You can ask your host if youre on shared.

I have another install and work only with 5,4

(2019-08-24, 10:54 PM)Roberth Wrote: [ -> ]I have another install and work only with 5,4

That's not smart nor recommended.

(2019-08-25, 01:34 AM)ArtForums Wrote: [ -> ]That's not smart nor recommended.

Correct. PHP 5.4 went end of life 3 Sep 2015. That's 4 years ago!

(2019-08-24, 08:26 PM)Roberth Wrote: [ -> ]Hei, what version for mybb is ok for php 5.4?

The 1.8.x is said to be compatible with PHP >= 5.2, listed in the MyBB 1.8 requirement page https://docs.mybb.com/1.8/install/requirements/ .

But just as other members have suggested in this thread, it's better to run PHP version at least 7.1 for security and performance reasons. PHP 7.0 might be also reliable but not recommended, if you're using Ubuntu 16.04 LTS which will support PHP 7.0's security fixes until Apr. 2021 by its End of Standard Support.

(2019-08-25, 08:42 AM)noyle Wrote: [ -> ]

(2019-08-24, 08:26 PM)Roberth Wrote: [ -> ]Hei, what version for mybb is ok for php 5.4?

The 1.8.x is said to be compatible with PHP >= 5.2, listed in the MyBB 1.8 requirement page https://docs.mybb.com/1.8/install/requirements/ .

But just as other members have suggested in this thread, it's better to run PHP version at least 7.1 for security and performance reasons. PHP 7.0 might be also reliable but not recommended, if you're using Ubuntu 16.04 LTS which will support PHP 7.0's security fixes until Apr. 2021 by its End of Standard Support.

I second this notion. 

Try to upgrade to PHP 7.1... at least. 

That way your testing on more recent software versions, not the old versions that are 4 to 5 years old.