wp-admin shows blank page, how to fix it?

Question

I am working with WordPress 3.5.8. Yesterday I made some changes into it to a friend. I don\'t know what happened, but after some time when I try to log in at wp-admin side and

Answer 1

Had this same issue after changing the PHP version from 5.6 to 7.3 (eaphp73). So what I did was I simply changed the version to alt-php74.

So what's the problem? Probably a plugin that relied on a certain PHP extension that wasn't available on eaphp73.

Before you touch any wordpress files, just try changing your site's PHP version. You can do this in the cPanel.

And if that doesn't work, go back into the cPanel and activate every PHP extension there is. And if your site starts working at this stage, then it's probably an extension it couldn't function without. Now slowly work backwards deactivating (one at a time) ONLY the extensions you just activated.

You should be able to figure out which extension was the required feature.

Can it be a plugin that's causing the issue? Certainly. Maybe the rogue plugin just wanted that extra extension.

If changing the PHP version, and juggling with the PHP extensions didn't work, then try renaming (which automatically deactivates) one plugin folder at a time.