Convert associative array to multidimensional array with value - php

Question

This is an interesting situation which I created a working function for, but wondering if I just anyone had any simpler methods for this.
I have the following multidimensional array:
$foo = array(
[0] => array(
'keys' => array(
'key1' => 1,
'key2' => a,
'key3' => 123
),
'values' => array(
//goodies in here
)
)
[1] => array(
'keys' => array(
'key1' => 1,
'key2' => b,
'key3' => 456
),
'values' => array(
//goodies in here
)
)
)
What I wanted, was to transform this into a multidimensional array nested based on the values from the keys array, the output I was looking for is:
$bar = array(
[1] => array(
[a] => array(
[123] => array( //values array from above )
),
[b] => array(
[456] => array( //values array from above )
)
)
)
The keys can always be nested based on their position in the keys array, but the keys themselve are not always the same, keys handles a user defined grouping, so the order and values can change. I also didn't want duplicate keys.
array_merge failed me because in a lot of cases, the array keys are actually numeric ids. So, this function works - but I'm wondering if I made myself a new pair of gloves.
protected function convertAssociativeToMulti( &$output, $keys, $value )
{
$temp = array();
$v = array_values( $keys );
$s = sizeof( $v );
for( $x = 0; $x < $s; $x++ )
{
$k = $v[ $x ];
if ( $x == 0 )
{
if ( !array_key_exists( $k, $output ) )
$output[ $k ] = array();
$temp =& $output[ $k ];
}
if ( $x && ( $x + 1 ) !== $s )
{
if( !array_key_exists( $k, $temp ) )
$temp[ $k ] = array();
$temp =& $temp[$k];
}
if ( ( $x + 1 ) == $s )
$temp[$k] = $value;
}
}
$baz = array();
foreach( $foo as $bar )
{
$this->convertAssociativeToMulti( $baz, $bar['keys'], $bar['values'] );
}
So, how do you do this more simply / refactor what I have?

Answer 1

This is a bit more concise (See it in action here):
$bar=array();
foreach($foo as $item)
{
$out=&$bar;
foreach($item['keys'] as $key)
{
if(!isset($out[$key])) $out[$key]=array();
$out=&$out[$key];
}
foreach($item['values'] as $k=>$v) $out[$k]=$v;
// $out=array_merge($out,$item['values']); -- edit - fixed array_merge
}
var_dump($bar);