php reformat nested array - php

Question

I have a stored unlimited nested levels array with unwanted extra data.
$arr = array(
array(
'name' => 'item1',
'level' => 0,
'extra_key' => 'some_data',
'children' => array(
'name' => 'sub-item1',
'level' => 1,
'extra_key' => 'some_data',
'children' => array(
'name' => 'sub-sub-item1',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
array(
'name' => 'sub-sub2-item1',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
)
),
array(
'name' => 'item2',
'level' => 0,
'extra_key' => 'some_data',
'children' => array(
'name' => 'sub-item2',
'level' => 2,
'extra_key' => 'some_data',
'children' => array(
'name' => 'sub-sub-item2',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
array(
'name' => 'sub-sub2-item2',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
)
),
array(
'name' => 'item3',
'level' => 0,
'extra_key' => 'some_data',
'children' => array(
'name' => 'sub-item3',
'level' => 1,
'extra_key' => 'some_data',
'children' => array(
'name' => 'sub-sub-item3',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
array(
'name' => 'sub-sub2-item3',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
)
),
);
Expected output array:
$arr = array(
array(
'name' => 'item1',
'nodes' => array(
'name' => 'sub-item1',
'nodes' => array(
'name' => 'sub-sub-item1',
'nodes' => array()
),
array(
'name' => 'sub-sub2-item1',
'nodes' => array()
),
)
),
array(
'name' => 'item2',
'nodes' => array(
'name' => 'sub-item2',
'nodes' => array(
'name' => 'sub-sub-item2',
'nodes' => array()
),
array(
'name' => 'sub-sub2-item2',
'nodes' => array()
),
)
),
array(
'name' => 'item3',
'nodes' => array(
'name' => 'sub-item3',
'nodes' => array(
'name' => 'sub-sub-item3',
'nodes' => array()
),
array(
'name' => 'sub-sub2-item3',
'nodes' => array()
),
)
)
);
I want to remove unwanted keys like level , extra_key from all levels and i want also to change the name of the key children to nodes then reproduce the same array with the same structure with the new format.
How can i achieve that?
I tried to do it by recursive function but i failed to reproduce the same structrue

Answer 1

Your structure doesn't make sense, probably because of that you was unable to write recursive function. If it is possible to change structure, I would suggest this one (with reformat function implementation):
<?php
$actual = array(
array(
'name' => 'item1',
'level' => 0,
'extra_key' => 'some_data',
'children' => array(
array(
'name' => 'sub-item1',
'level' => 1,
'extra_key' => 'some_data',
'children' => array(
array(
'name' => 'sub-sub-item1',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
array(
'name' => 'sub-sub2-item1',
'level' => 2,
'extra_key' => 'some_data',
'children' => array()
),
)
),
)
),
);
$expected = array(
array(
'name' => 'item1',
'nodes' => array(
array(
'name' => 'sub-item1',
'nodes' => array(
array(
'name' => 'sub-sub-item1',
'nodes' => array()
),
array(
'name' => 'sub-sub2-item1',
'nodes' => array()
),
),
),
)
),
);
function change_array($original)
{
return array_map('change_node', $original);
}
function change_node($node)
{
return [
'name' => $node['name'],
'nodes' => array_map('change_node', $node['children']),
];
}
var_dump($expected === change_array($actual));

Answer 2

This function will do what you want recursively.
You can add extra excluded and/or renamed indices if required;
function parseArray($array): array
{
// The resulting array
$result = [];
// Indices you want renamed [`from` => `to`]
$renameIndices = ['children' => 'nodes'];
// Indices you want excluded [`1`, `2`]
$excludedIndices = ['level', 'extra_key'];
foreach ($array as $idx => $content)
{
// If excluded, continue (skip) node.
if (in_array($idx, $excludedIndices, true))
{
continue;
}
// Setting the resulting (new) index.
$resultIdx = $idx;
// Check if this index should be renamed
if (array_key_exists($idx, $renameIndices))
{
// If index should be renamed, apply new name
$resultIdx = $renameIndices[$idx];
}
// If this content block is an array. Parse it.
if (is_array($content))
{
$content = parseArray($content);
}
// Save content to resulting array.
$result[$resultIdx] = $content;
}
return $result;
}