502 Gateway Error about fpdi

[tandrus-mc]

fpdf/fpdi is incompatible with php7.1 you need to revert back to 7.0 and your issue should be resolved.

[JanSlabon]

@tandrus-mc Why should it be incompatible to PHP 7.1? Do you have any further information for this statement? I just passed our dev version to 7.1 and all went through. I cannot remember any special change which was related to an issue with 7.1?

A gateway error shouldn't be related to PHP at all, doesn't it? Did you checked your error logs? of all involved processes?

[mikebronner]

Hi @JanSlabon, the reason I see this as being incompatible with PHP7.1 is that when I try to run it in my PHP7.1 environment I get 502 Gateway errors, and when I run the exact same code in a PHP7.0 environment it works.

Many developers seem to be reporting this problem, and it might be related to usage in Laravel Homestead (a Vagrant VM development environment), or it's specific server configuration, but I find that unlikely because it works in Homestead with PHP7.0.

PHP can trigger gateway errors that cause the PHP process to crash, which then cuts communication to NGINX, triggering a 502 Gateway error.

[JanSlabon]

@mikebronner and what do you have in your error logs?
Do you have a link for us where the problem is reported by "many developers"? Maybe they have more information. Your description is sadly very vague and as we are unable to reproduce this in a "normal" environment.

BTW: What version are you using? The official version is not namespaced?

[JanSlabon]

There seems to be a bug report for an issue on bugs.php.net which is related to FPDF (so also FPDI), which seems to be fixed in the next 7.1 release.

[mikebronner]

@JanSlabon Thanks for following up. I have been trying different FPDF wrappers, as well as yours to see if it was a "packaging issue". Here's a link where I'm trying to figure out the issue with someone else in the same boat, and I'm compiling any info on the issue I can find:

https://laracasts.com/discuss/channels/lumen/fpdi-instantiation-results-in-502-bad-gateway

Thanks for the link to the bug report.

~Mike

[JanSlabon]

Did you checked if you can reproduce the issue if opcache.enabled is set to 0?

This statement from @tandrus-mc makes me think that it is opcache related (as also the bug report):

Oddly enough if I change something in fpdf class, save it and rerun it it works once.

Can you verify this?

[w3sami]

Hi,
having the same issue with 7.1. verifying that disabling opcache resolves the issue. no more crash at new FPDI() \0/
my script is not still working, but that's propably just my proto code in infancy :)

[w3sami]

and, yes! even the code works! I can overlay text on a pdf and save it. so all issues resolved when disabling opcache. not a real solution, but works for me atm! thanks jan for figuring this out!

[JanSlabon]

PHP 7.1.1 is out - it should fix this issue. Could you please confirm, so that we can close this issue?

Thanks!
Jan

[w3sami]

hi!

I can confirm that the issue is resolved already at PHP 7.1.0-5 (before update it was 7.1.0-3 and not working)
PHP 7.1.0-5 is the version that the sury ppa provides for ubuntu atm

[JanSlabon]

As we didn't got any further report regarding that issue and it seems to be fixed in (at least) PHP 7.1.1 I will close that one.