My own LC_ALL error

[adrianTNT]

youtube-dl --version
2017.10.15.1

I am getting:

WARNING: Assuming --restrict-filenames since file system encoding cannot encode all characters. Set the LC_ALL environment variable to fix this.

And I managed to set the LC_ALL variable (a pain to make it persistent), now I see it in the locale command or when tesiting with:

echo $LC_ALL
en_US

Any tips ? I seen it is a common error but couldn't get a clear fix.

 youtube-dl -v
[debug] System config: [u'--prefer-free-formats']
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v']
[debug] Encodings: locale ISO-8859-1, fs ISO-8859-1, out ISO-8859-1, pref ISO-8859-1
[debug] youtube-dl version 2017.10.15.1
[debug] Python version 2.7.5 - Linux-3.10.0-693.5.2.el7.x86_64-x86_64-with-centos-7.4.1708-Core
[debug] exe versions: ffmpeg 2.8.13, ffprobe 2.8.13
[debug] Proxy map: {}
Usage: youtube-dl [OPTIONS] URL [URL...]

[adrianTNT]

I keept getting above error when running youtube-dl with exec() function from PHP.
Testing more I seen I don't get the error in CLI enviroment.
Then I was able to avoid the error by specifying LC_ALL before calling youtube-dl in PHP:

exec("LC_ALL=en_US.UTF-8 youtube-dl --get-title 'https://www.youtube.com/watch?v=Mra-2sxjkIY' 2>&1", $output);

[dstftw]

LC_ALL must be set to a locale capable of UTF-8.