Recursively Reformat Prefixed Array [duplicate] - php

Question

This question already has answers here:
How to access and manipulate multi-dimensional array by key names / path?
(10 answers)
Closed 6 years ago.
How can I convert a flat array into a nested array where the nested keys are prefixed with the same value. For example say I have the following array:
[
'name' => 'a',
'content' => 'b',
'author_fullName' => 'c',
'author_email' => 'd',
'author_role_name' => 'e'
]
Then the out of the array would be:
[
'name' => 'a',
'content' => 'b',
'author' => [
'fullName' => 'c',
'email' => 'd',
'role' => [
'name' => 'e'
]
]
]
Ideally I'd like a solution using the built in array functions as I prefer functional syntax rather than using for loops. I'd appreciate the help. Thanks

Answer 1

Try below code:
<?php
$a = [
'name' => 'a',
'content' => 'b',
'author_fullName' => 'c',
'author_email' => 'd',
'author_role_name' => 'e'
];
$finalArray =[];
array_walk($a, function(&$value, $key) use(&$finalArray) {
$indexes = explode('_',$key);
foreach ($indexes as $index){
$finalArray = &$finalArray[$index];
}
$finalArray = $value;
});
print_r($finalArray);

Answer 2

Another solution
$delimiter = '_';
$result = [];
foreach($array as $k => $v)
{
$split = explode($delimiter, $k, 2);//explode only as much as we need
if(count($split) > 1)
{
if(!isset($result[$split[0]]))
{
$result[$split[0]] = [];
}
//this assumes we're not interested in more than two depths
//in tandem with the explode limit
$result[$split[0]][$split[1]] = $v;
}
else
{
$result[$k] = $v;
}
}