How to break string by separator into multidimensional array in PHP - php

Question

I have a string 'value1/value2'. The required output is $_SESSION['value1']['value2']. i tried using explode and then array_reduce over explode values but with no success.
My code looks like
function set($key, $value){
/* code */
}
set('key1/key2', 'some_text');
required output like $_SESSION['key1']['key2'] = 'some_text';
key1/key2 is not fixed it may be 'key1' or 'key1/key2/key3' and so on.
Anyone be make fiddle of it is Highly appreciable.
Thanks

Answer 1

Accessing a value via a key-path string, as in your original question, using your original idea and let array_reduce do the work looks like:
$session = ['value1' => [ 'value2' => [ 'value3' => 'there you are!' ]]];
$path = explode('/', 'value1/value2/value3');
$val = array_reduce($path,
function(&$carry, $key) { return $carry[$key];},
$session);
echo $val
--> "there you are!"
Setting a value can be done e.g. like this, following the path by reference, creating arrays as needed:
function set($path, $value) {
$path = explode('/', $path);
$key = array_pop($path);
$arr = &$_SESSION;
foreach($path as $part) {
// carefull, this might lose values to accommodate
// the structure wanted with $path
(isset($arr[$part]) && is_array($arr[$part])) || ($arr[$part] = []);
$arr =& $arr[$part];
}
$arr[$key] = $value;
};

Answer 2

Try this
<?php
session_start();
$string = 'value1/value2';
$array = explode("/",$string);
$_SESSION[$array[0]][$array[1]] = "ccccccc";//$_SESSION['value1']['value2']

Answer 3

For a general case (i.e. for more than two pieces), you'll need to iterate over the segments, and incrementally index further into your target array:
<?php
$string = 'value1/value2/value3';
$_SESSION = ['value1' => ['value2' => ['value3' => 'My String']]];
$target = $_SESSION;
foreach (explode('/', $string) as $piece) {
$target =& $target[$piece];
}
echo $target; // My String