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@ 2015-09-15T11:25:52Z

<?php

function flatten_array($array, $preserve_keys = 0, &$out = array()) {
    # Flatten a multidimensional array to one dimension, optionally preserving keys.
    #
    # $array - the array to flatten
    # $preserve_keys - 0 (default) to not preserve keys, 1 to preserve string keys only, 2 to preserve all keys
    # $out - internal use argument for recursion
    foreach($array as $key => $child)
        if(is_array($child))
            $out = flatten_array($child, $preserve_keys, $out);
        elseif($preserve_keys + is_string($key) > 1)
            $out[$key] = $child;
        else
            $out[] = $child;
    return $out;
}



$array = array(
	'first' => 1,
	'second' => 2,
	'query' => array(
		'id' => 314,
		'descripcion' => 'Test',
		'files' => array(
			array(
				'name' => 'Readme.txt',
				'path' => '/tmp/43143431431343',
			),
			array(
				'name' => 'Picture.jpg',
				'path' => '/tmp/98794894594655',
			),
		),
	),
	'last' => 99,
);

echo "Original:\n";
var_export($array);

echo "\n\nFlat:\n";
var_export( flatten_array($array, 1) );

Output for git.master_jit, git.master, rfc.property-hooks: Original: array ( 'first' => 1, 'second' => 2, 'query' => array ( 'id' => 314, 'descripcion' => 'Test', 'files' => array ( 0 => array ( 'name' => 'Readme.txt', 'path' => '/tmp/43143431431343', ), 1 => array ( 'name' => 'Picture.jpg', 'path' => '/tmp/98794894594655', ), ), ), 'last' => 99, ) Flat: array ( 'first' => 1, 'second' => 2, 'id' => 314, 'descripcion' => 'Test', 'name' => 'Picture.jpg', 'path' => '/tmp/98794894594655', 'last' => 99, )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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