Push rejected, failed to detect set buildpack heroku/php

Question

I'm trying to deploy my php app from github to heroku, but it's not working. I've had experience with deploying php apps to heroku, but for some reason, I'm having trouble this time.

This is what I've done.

1. Created an app in heroku
2. Linked my github to my heroku app
3. Added a remote to heroku app from my local directory
4. Set buildpack to php
5. Run git push heroku master

My directory has the following files:

home.html
index.php
index.css

Here's my index.php: Push rejected, failed to detect set buildpack heroku/php

This is what i got after step 5:

Counting objects: 52, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (48/48), done.
Writing objects: 100% (52/52), 1.12 MiB | 1.23 MiB/s, done.
Total 52 (delta 20), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Using set buildpack heroku/php
remote:
remote:  !     Push rejected, failed to detect set buildpack heroku/php
remote: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
remote:
remote: Verifying deploy....
remote:
remote: !   Push rejected to appp.
remote:
To https://git.heroku.com/appp.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/appp.git'

Here is my heroku logs:

2015-11-19T00:22:31.307947+00:00 heroku[api]: Set BUILDPACK_URL config vars by [email protected]
2015-11-19T00:22:31.307947+00:00 heroku[api]: Release v3 created by [email protected]
2015-11-19T00:22:43.284779+00:00 heroku[slug-compiler]: Slug compilation started
2015-11-19T00:22:43.284789+00:00 heroku[slug-compiler]: Slug compilation failed: failed to detect set buildpack heroku/php
2015-11-19T00:22:43.284790+00:00 heroku[slug-compiler]: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
2015-11-19T00:27:00.648462+00:00 heroku[api]: Starting process with command `false && AUTOMATED DIAGNOSIS BEING RUN BY HEROKU SUPPORT; cat Procfile` by [email protected]
2015-11-19T00:27:01.379352+00:00 heroku[run.2268]: Awaiting client
2015-11-19T00:27:01.441226+00:00 heroku[run.2268]: Starting process with command `false && AUTOMATED DIAGNOSIS BEING RUN BY HEROKU SUPPORT; cat Procfile`
2015-11-19T00:27:01.858759+00:00 heroku[run.2268]: State changed from starting to up
2015-11-19T00:27:03.971434+00:00 heroku[run.2268]: Process exited with status 1
2015-11-19T00:27:03.989162+00:00 heroku[run.2268]: State changed from up to complete
2015-11-19T00:30:14.310979+00:00 heroku[slug-compiler]: Slug compilation started
2015-11-19T00:30:14.310987+00:00 heroku[slug-compiler]: Slug compilation failed: failed to detect set buildpack heroku/php
2015-11-19T00:30:14.310988+00:00 heroku[slug-compiler]: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
2015-11-19T00:31:54.735764+00:00 heroku[slug-compiler]: Slug compilation started
2015-11-19T00:31:54.735775+00:00 heroku[slug-compiler]: Slug compilation failed: failed to detect set buildpack heroku/php
2015-11-19T00:31:54.735776+00:00 heroku[slug-compiler]: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
2015-11-19T00:34:31.326372+00:00 heroku[slug-compiler]: Slug compilation started
2015-11-19T00:34:31.326383+00:00 heroku[slug-compiler]: Slug compilation failed: failed to detect set buildpack heroku/php
2015-11-19T00:34:31.326385+00:00 heroku[slug-compiler]: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
2015-11-19T00:34:37.003934+00:00 heroku[slug-compiler]: Slug compilation started
2015-11-19T00:34:37.003944+00:00 heroku[slug-compiler]: Slug compilation failed: failed to detect set buildpack heroku/php
2015-11-19T00:34:37.003946+00:00 heroku[slug-compiler]: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure

Answer 1

In my case, I needed to have a composer.json file in the same directory where my git folder is. Also make sure you included the json file in your commit before trying to do git push heroku master.

My composer.json file contains only this so it's a valid json.

{ }