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up vote 0 down vote favorite

I have a problem I cannot fix. I have 2 arrays and a string. The first array contains the keys the second one should use. The first one is like this:

Array
(
    [0] => foo
    [1] => bar
    [2] => hello
)

Now I need a PHP code that converts it to the second array:

Array
(
    [foo] => Array
        (
            [bar] => Array
                (
                    [hello] => MyString
                )
        )
)

The number of items is variable.

Can someone please tell me how to do this?

share|improve this question
2  
What have you tried? –  Niet the Dark Absol Mar 30 '13 at 14:08
2  
Walk the array back to front ;-) –  Havelock Mar 30 '13 at 14:10

2 Answers 2

up vote 2 down vote accepted

You should use references to solve this problem: 

$a = array (0 => 'foo', 1 => 'bar', 2 => 'hello' );

$b = array();
$ptr = &$b;
foreach ($a as $val) {
    $ptr[$val] = Array();
    $ptr = &$ptr[$val];
}
$ptr = 'MyString';
var_dump($b);
share|improve this answer
    
Thanks! The problem was that I didn't know the use of &. –  Wietse de Vries Mar 30 '13 at 14:25
    
@WietsedeVries you are welcome. –  netme Mar 30 '13 at 14:27
up vote 2 down vote

All you need is : 

$path = array(
        0 => 'foo',
        1 => 'bar',
        2 => 'hello'
);

$data = array();
$t = &$data;
foreach ( $path as $key ) {
    $t = &$t[$key];
}
$t = "MyString";
unset($t);

print_r($data);

See Live Demo

share|improve this answer
    
Thanks, but Netme was a bit faster. –  Wietse de Vries Mar 30 '13 at 14:26

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