PHP Increment array keys +1 - php

Question

I'm looking for some simple solution (1 line) to increment all the keys +1 in an multi array.
Array (
0 => Array (
7 => 'foo',
13 => 'foo'
),
1 => Array (
2 => 'foo',
25 => 'foo'
),
4 => Array (
24 => 'foo'
)
)
RESULT ARRAY
Array (
1 => Array (
8 => 'foo',
14 => 'foo'
),
2 => Array (
3 => 'foo',
26 => 'foo'
),
5 => Array (
25 => 'foo'
)
)

Answer 1

$data = [
0 => [7 => 'foo', 13 => 'foo'],
1 => [2 => 'foo', 25 => 'foo'],
4 => [24 => 'foo'],
];
// top level
$data = array_combine(
array_map(function ($key) { return ++$key; }, array_keys($data)),
$data
);
// then the elements (use array_walk_recursive() if you have more levels)
array_walk(
$data,
function(&$data) {
$data = array_combine(
array_map(function ($key) { return ++$key; }, array_keys($data)),
$data
);
}
);
var_dump($data);
Demo

Answer 2

I'm not sure about a one-liner, especially since you have a multidimensional array. However, this is how I would do it. Honestly, all that one-liner elegance will just make things more complicated for you anyway. It's better to go with readable code in my humble opinion.
// Example array
$array = array (
0 => array (
7 => 'foo',
13 => 'foo'
),
1 => array (
2 => 'foo',
25 => 'foo'
),
4 => array (
24 => 'foo'
)
);
// My solution to increment each key and nested key
$new = array();
foreach($array as $key => $value) {
foreach($value as $inkey => $inval) {
$value[$inkey+1] = $inval;
unset($value[$inkey]);
}
$new[$key+1] = $value;
}
$array = $new;
// Display the array
echo '<pre>'; print_r($array); echo '<pre/>';