wp-tinymce.php occasionally returning partial Javascript

[tech163]

I am running a WordPress Multi-Site install. After upgrading to PHP 5.3.9 last evening, all the TinyMCE on all the blogs broke. All the buttons disappeared and the HTML magically became white (see screenshot).

After disabling all the plugins, this was still broken (continuously opened and closed, and tried in Chrome incognito window). However, it does work on a brand new install of WP on 5.3.9, so I'm not exactly sure what's wrong. Downgrading to 5.3.8 fixed the problem on my multisite. I think it's definitely possible that it's a WP bug, so any debugging I should do?

[markoheijnen]

Update mine server also to 5.3.9 and I don't see this issue. Sounds more as a javascript issue since the rest is loaded.

[tech163]

It seems to be a problem with wp-tinymce.php. From time to time, it only returns part of the entire code required. Take a look at the two new attachments. I have added

error_reporting(E_ALL | E_STRICT);

but no error has appeared.

[azaozz]

Replying to tech163:

It seems to be a problem with wp-tinymce.php. From time to time, it only returns part of the entire code required.

Been hearing about this happening randomly. There are no PHP errors, no server errors and no HTTP errors however some (larger) js and/or css files are truncated sometimes. Not really sure what could be causing this, at one point was able to trace it to faulty net cache at the ISP.

However in your case it seems connected to the server since it started happening after updating PHP. Don't think it has anything to do with the PHP version, perhaps some conflicting setting or loadable module, etc.

[tech163]

It seems to me more like a PHP issue now, as file_get_contents() only read parts of file for some reason.