Generate multidimensional array from array of values - php

Question

I have an array with keys that describe location in a multidimensional array like:
array(
'3728:baskets:4839:1' => 'apple',
'3728:baskets:4839:2' => 'orange',
'3728:baskets:4920:1' => 'cherry',
'3728:baskets:4920:2' => 'apple',
'9583:baskets:4729:1' => 'pear',
'9583:baskets:4729:2' => 'orange',
'9583:baskets:6827:1' => 'banana',
'9583:baskets:6827:2' => 'pineapple',
);
I would like to pass this array to a function that generates a multidimensional array based on the the pieces in the keys delimited by the ":". The resulting array should look like:
array(
3728 => array(
'baskets' => array(
4839 => array(
1 => 'apple',
2 => 'orange',
),
4920 => array(
1 => 'cherry',
2 => 'apple',
),
),
),
9583 => array(
'baskets' => array(
4729 => array(
1 => 'pear',
2 => 'orange',
),
6827 => array(
1 => 'banana',
2 => 'pineapple',
),
),
),
);
Any ideas?

Answer 1

function array_createmulti($arr) {
// The new multidimensional array we will return
$result = array();
// Process each item of the input array
foreach ($arr as $key => $value) {
// Store a reference to the root of the array
$current = &$result;
// Split up the current item's key into its pieces
$pieces = explode(':', $key);
// For all but the last piece of the key, create a new sub-array (if
// necessary), and update the $current variable to a reference of that
// sub-array
for ($i = 0; $i < count($pieces) - 1; $i++) {
$step = $pieces[$i];
if (!isset($current[$step])) {
$current[$step] = array();
}
$current = &$current[$step];
}
// Add the current value into the final nested sub-array
$current[$pieces[$i]] = $value;
}
// Return the result array
return $result;
}

Answer 2

It would be faster then previous answer:
function formatMyData($data)
{
$res = array();
foreach($data as $key => $value) {
list($a, $b, $c, $d) = explode(':', $key);
if (!isset($res[$a])) {
$res[$a] = array(
$b => array(
$c => array(
$d => $value
)
)
);
}
else if (!isset($res[$a][$b])) {
$res[$a][$b] = array(
$с => array(
$d => $value
)
);
}
else if (!isset($res[$a][$b][$c])) {
$res[$a][$b][$c] = array(
$d => $value
);
} else {
$res[$a][$b][$c][$d] = $value;
}
}
return $res;
}
See in action