How to convert a multidimensional array to $_SESSION keys in PHP - php

Question

There is an array like this (Actually I don't know the depth of it, just show you its structures):
$ary = array(
'A' => array(
'B' => array(
'C' => array(
'D' => array(
'E' => 'F'
)
)
)
)
);
What I want is convert this array as a $_SESSION's keys and then get it's value like this:
$val = $_SESSION['A']['B']['C']['D']['E']['F'];
Cause I don't know how depth this array has, so all I'm doing right now is just keep looping it, is_array then foreach, is_array then foreach...... until the last item in this array like this:
$val = $_SESSION['A'];
$val = $_SESSION['A']['B'];
$val = $_SESSION['A']['B']['C'];
$val = $_SESSION['A']['B']['C']['D'];
......
There must be some ways more elegant than this, any thoughts would be appreciated !!!
UPDATE:
This is what I found last night:
public static function array_keys_multi(array $array)
{
$keys = array();
foreach ($array as $key => $value) {
$keys[] = $key;
if (is_array($array[$key])) {
$keys = array_merge($keys, array_keys_multi($array[$key]));
} else {
$keys[] = $value;
}
}
return $keys;
}
$params = '$_SESSION[\'' . implode('\'][\'', static::array_keys_multi($keys)) . '\']';
$exectuion = 'isset(' . $params . ')?' . $params . ':\'\'';
eval('return ' . $exectuion . ';');

Answer 1

Since no one has any idea, I post here mine:
public static function array_keys_multi(array $array)
{
$keys = array();
foreach ($array as $key => $value) {
$keys[] = $key;
if (is_array($array[$key])) {
$keys = array_merge($keys, array_keys_multi($array[$key]));
} else {
$keys[] = $value;
}
}
return $keys;
}
$params = '$_SESSION[\'' . implode('\'][\'', static::array_keys_multi($keys)) . '\']';
$exectuion = 'isset(' . $params . ')?' . $params . ':\'\'';
eval('return ' . $exectuion . ';');