unflat.php

<?php

function unflat($record, $separator = '.')
{
    $result = [];
    foreach ($record as $key => $value) {
        $parts = explode($separator, $key);
        $count = count($parts);
        unset($last); // Nettoyage, pour éviter l'empîlement
        $new_field =& $last;
        foreach ($parts as $i => $part) {
            if ($i < $count - 1) {
                $last =& $last[$part];
            } else {
                $last[$part] = $value;
            }
        }
        $result = array_merge_recursive($result, $new_field);
    }
    return $result;
}