Some questions about CodeIgniter (not CI4)

Hello,

I lot a friends says me: 

Itsn't secure, beacause: "XSS is filter only at the entrance and not output. Filter the entire input HTML in the database that is chaotic and it does not allow any alternative filtering." I think CI3 is a "Safe disaster.".

CI itself advises you to do XSS filtering on output instead of input ...

He continued "The community dies, because the community to quickly migrate to Laravel, Symfony, Yii, CakePHP, because with a little good will and even by not complying with the standards, we arrive at a similar result with almost three CI times less restriction and faster".

I don't even understand what that means ... All I get is focus on popularity and unknown "standards".

He share me some articles:

• https://www.sitepoint.com/community/t/i-...ice/113413
  
• http://mulzer.tumblr.com/post/2414199311...igniter-to
  
• https://philsturgeon.uk/codeigniter/2012...a-rewrite/
  
• https://thecelavi.wordpress.com/2014/01/...deigniter/
  

The first link is filled with random people's comments.
The second is obviously written with the single goal of advertising Laravel (and contains many false statements too).
The third is fair criticism from a former CodeIgniter developer, but addressing such concerns is why CI4 is a rewrite. It's an article about the future evolution of CI, not one that should take as "don't use CI".
And the last one is ... a Symfony fanboy saying that CI isn't Symfony and therefore is evil - pure bigotry.

He sais "He said that no standard does codeigniter respect."

Again, a standard for what?

"CodeIgniter does not contain any class naming convention.".

That's just a lie.

He ends by saying "Using codeigniter can not qualify PHP developer with the ability to object".

Why ? I don't know.

That's a good question, because that quote is completely meaningless.

I have somequestions so:

1. Why not make codeigniter respects the standards?
   
2. Why codeigniter is frowned upon by many?
   
3. Is the other who is wrong, or do we question ourselves.
   
4. Is that with CodeIgniter 4, we will finally be able to take the place we deserve? Or is what we as users codeigniter, we will continue to be denigrated.
   
5. My impression, reading other than codeigniter is breathless. It gets to the end. Should we migrate framework?
   

Sorry, I'm French, i using Google Translate.

Just, if you can answer me ... :/

Thanks, Dylan.

Every other framework tries to be everything for everybody, so a lot of people expect the same from CI. Only, it's a simple framework, for simple projects.

CodeIgniter has its problems, but every framework has its flaws. People just love to hate and you happened to meet one that hates CI.

I believe I've answered the rest of your questions above.