Absolute free hosting for php and mysql

1) For sharing code, best to use https://GitHub.com for this.

https://github.com/pricing provides pricing.

Either $0/month or $7/month, depending of features you require.

2) Unsure why you'd require MariaDB/MySQL for this.

As Noah suggested, clarify exactly what you'll providing which might require database services.

3) Tip: Nothing is ever free. Services which are free of charge ($0 for full LAMP Stack hosting) either have hidden costs, like pushing ads to visitors which will reduce traffic or services have many problems, like running old software + providing no support for tech issues.

Best if you also mention any type of monetization approach you have for your project, as this will expand your range of possibilities.

Note: Looks like GitHub also provides running LAMP Stacks very cheaply also.

Check the pricing page detail.

Hi,

If you only need a way to share your code, you can have a zip file on Gmail, Dropbox or Idrive free plan  and a Facebook page.

You can also use this temporary fiddle tool (but they reset the code, so it is just for preview or debug or quick share)
http://phpfiddle.org/

If you plan to have an opensource project, I would use Github like David proposed, because you will have bug trackings, code comparision, versionning, wiki....

Github is free for opensource.  Bitbucket is free for close projects of 5 or less people https://bitbucket.org/product/pricing

I agree with David here. There is no real "free" lunch as they say.  If it is just for playing or testing, fine, but I would want more control and support. You might want to check out free trials with Azure for 12 months https://azure.microsoft.com/en-us/free/ or even AWS https://aws.amazon.com/free/start-your-free-trial/ or Google.  

With those choices, it will be easy to move to paid and scale.