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# Flatten Array

Take a nested list and return a single flattened list with all values except nil/null.

The challenge is to write a function that accepts an arbitrarily-deep nested list-like structure and returns a flattened structure without any nil/null values.

For Example

input: [1,[2,3,null,4],[null],5]

output: [1,2,3,4,5]


## Running the tests

1. Go to the root of your PHP exercise directory, which is `<EXERCISM_WORKSPACE>/php`.
   To find the Exercism workspace run

        % exercism debug | grep Workspace

1. Get [PHPUnit] if you don't have it already.

        % wget --no-check-certificate https://phar.phpunit.de/phpunit.phar
        % chmod +x phpunit.phar

2. Execute the tests:

        % ./phpunit.phar flatten-array/flatten-array_test.php

[PHPUnit]: http://phpunit.de


## Source

Interview Question [https://reference.wolfram.com/language/ref/Flatten.html](https://reference.wolfram.com/language/ref/Flatten.html)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

Version data entries

75 entries across 75 versions & 1 rubygems

Version Path
trackler-2.2.1.180 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.179 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.178 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.177 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.176 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.175 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.174 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.173 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.172 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.171 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.170 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.169 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.167 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.166 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.165 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.164 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.163 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.162 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.161 tracks/php/exercises/flatten-array/README.md
trackler-2.2.1.160 tracks/php/exercises/flatten-array/README.md