Kanboard requires at least PHP 5.6 now

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-# array_column() for PHP
-
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-[![License](https://poser.pugx.org/ramsey/array_column/license.svg)](https://packagist.org/packages/ramsey/array_column)
-
-This simple library provides functionality for [`array_column()`](http://php.net/array_column)
-to versions of PHP earlier than 5.5. It mimics the functionality of the built-in
-function in every way.
-
-
-## Usage
-
-```
-array array_column(array $input, mixed $columnKey[, mixed $indexKey])
-```
-
-Given a multi-dimensional array of data, `array_column()` returns the values
-from a single column of the input array, identified by the `$columnKey`.
-Optionally, you may provide an `$indexKey` to index the values in the returned
-array by the values from the `$indexKey` column in the input array.
-
-For example, using the following array of data, we tell `array_column()` to
-return an array of just the last names, indexed by their record IDs.
-
-``` php
-<?php
-$records = array(
-    array(
-        'id' => 2135,
-        'first_name' => 'John',
-        'last_name' => 'Doe'
-    ),
-    array(
-        'id' => 3245,
-        'first_name' => 'Sally',
-        'last_name' => 'Smith'
-    ),
-    array(
-        'id' => 5342,
-        'first_name' => 'Jane',
-        'last_name' => 'Jones'
-    ),
-    array(
-        'id' => 5623,
-        'first_name' => 'Peter',
-        'last_name' => 'Doe'
-    )
-);
-
-$lastNames = array_column($records, 'last_name', 'id');
-```
-
-If we call `print_r()` on `$lastNames`, you'll see a resulting array that looks
-a bit like this:
-
-``` text
-Array
-(
-    [2135] => Doe
-    [3245] => Smith
-    [5342] => Jones
-    [5623] => Doe
-)
-```
-
-
-## Installation
-
-The easiest way to install this library is to use [Composer](https://getcomposer.org/):
-
-```
-php composer.phar require ramsey/array_column
-```
-
-Then, when you run `composer install`, everything will fall magically into place,
-and the `array_column()` function will be available to your project, as long as
-you are including Composer's autoloader.
-
-_However, you do not need Composer to use this library._
-
-This library has no dependencies and should work on older versions of PHP.
-Download the code and include `src/array_column.php` in your project, and all
-should work fine.
-
-When you are ready to run your project on PHP 5.5, everything should
-continue to run well without conflicts, even if this library remains included
-in your project.