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@ 2017-10-02T13:33:59Z

<?php

/**
 * Flatten a multi-dimensional array to a single-level array,
 * sorting the entries in order to depth first.
 * 
 * @param array $carry Optional Array to initialize
 * @param mixed $subject Array or value that has data in potential multi-dimensions.
 * 
 * @return array
 */
function array_flatten(?array $carry = [], $subject): array
{
    return array_reduce((array) $subject, function(array $carry, $item) {
        return is_array($item)
            ? array_flatten($carry, $item) 
            : array_merge($carry, (array) $item);
    }, (array) $carry);
}

print_r(array_flatten(null, array(
    array('A', 
        array('B',
            array('CC','CCCC','CCCCCC'), 
            array('DDD','EFG','HIJ','LMNOP')
        )
    ), 
    array('2'), 
    'b',
    array(array(),array(),array()),
)));

$array = array(1,2,[3,4],5,'six',array(array('78',9)),10);

print_r(array_reduce($array, "array_flatten"));

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Optional parameter $carry declared before required parameter $subject is implicitly treated as a required parameter in /in/J1NeJ on line 12 Array ( [0] => A [1] => B [2] => CC [3] => CCCC [4] => CCCCCC [5] => DDD [6] => EFG [7] => HIJ [8] => LMNOP [9] => 2 [10] => b ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => six [6] => 78 [7] => 9 [8] => 10 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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