Recommendation

As you know PHP 7.2 has been released while ago, so I recommend that you start using it ASAP, and you can get the same functionality that you have in this image by using my PHP7.2 image https://hub.docker.com/r/zaherg/php-7.2-xdebug-alpine/

Image description

This image contain php-7.1 based on alpine with xDebug enabled and Composer installed

PHP 7.1.24 (fpm-fcgi) (built: Nov 16 2018 05:54:39)
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies
    with Xdebug v2.6.1, Copyright (c) 2002-2018, by Derick Rethans

Runing the image:

By default xdebug is enabled, to disable it you need to create a .env file which should contain the following variables, but remember to change the value based one what you want to achieve:

PHP_XDEBUG_DEFAULT_ENABLE=0
PHP_XDEBUG_REMOTE_ENABLE=0
PHP_XDEBUG_REMOTE_HOST=127.0.0.1
PHP_XDEBUG_REMOTE_PORT=9001
PHP_XDEBUG_REMOTE_AUTO_START=0
PHP_XDEBUG_REMOTE_CONNECT_BACK=0
PHP_XDEBUG_IDEKEY=docker
PHP_XDEBUG_PROFILER_ENABLE=0
PHP_XDEBUG_PROFILER_OUTPUT_DIR=/tmp

Then run the docker and specify the env file that you have created like this

docker run --env-file .env -p 80:80 zaherg/php-7.1-xdebug-alpine

Installed modules information

It has the following modules:

[PHP Modules]

1. Core
2. ctype
3. curl
4. date
5. dom
6. fileinfo
7. filter
8. ftp
9. hash
10. iconv
11. json
12. libxml
13. mbstring
14. mcrypt
15. mysqlnd
16. openssl
17. pcre
18. PDO
19. pdo_mysql
20. pdo_sqlite
21. Phar
22. posix
23. readline
24. redis
25. Reflection
26. session
27. SimpleXML
28. soap
29. sodium
30. SPL
31. sqlite3
32. standard
33. tokenizer
34. xdebug
35. xml
36. xmlreader
37. xmlwriter
38. zlib

[Zend Modules]

1. Xdebug