Fatal error: Call to undefined function wp_raise_memory_limit()

Hi, @mleder. The wp_raise_memory_limit function is defined in WordPress’s /wp-includes/functions.php file; so try manually uploading that file again to the server, to see if that resolves the error.

I wish it were so, checked the functions.php file in 4.6 package, does have the php routine as the last item on that page. Uploaded the functions.php to the wp-admin folder (overwriting the existing one, which had the same date and time stamp). Restarted nginx. Same error.

I had the same problem
Fatal error: Call to undefined function wp_raise_memory_limit() in /var/sites/d/devcodeadventures.com/public_html/wp-admin/admin.php on line 141

I’m not sure how to FTP to my site.

I have the same problem, I updated WordPress to the latest version, and now whenever I try to access anything I get the message.

I don’t understand half of the original post (sorry), can anyone explain what to do in simple terms. Thanks in advance…

For me, I found that immediately BEFORE you initiate an update (either manually via FTP) or by clicking the update link in the admin area, that any caching that runs on the site needs to be flushed out. Once I started this procedure on other sites that needed to be updated (on the same server), I no longer had problems.

I faced the same issue, and I solved it this way:
https://wordpress.stackexchange.com/questions/238043/admin-blank-page-with-working-front-end-after-updating-to-wordpress-4-6

@alibasheer

Thanks for sharing the link.

Thanks @alibasheer – your solution worked for me too

I faced the same issue, and I solved it this way:
https://wordpress.stackexchange.com/questions/238043/admin-blank-page-with-working-front-end-after-updating-to-wordpress-4-6

Kudos for mentioning flushing the cache, that helped big time with this. Such a simple thing to do but I always forget about it…

• This reply was modified 7 years, 11 months ago by Jim.