language: PHP (php 5.4.4)
date: 191 days 20 hours ago
link:
visibility: public 
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<?php
 
function array_map_associative($callback, $array){
    $result = array();
    foreach ($array as $key => $value){
        $result[] = call_user_func($callback, $key, $value);
    }
    return $result;
}
 
function callback($key, $value){
    return $key . '-' . $value;
}
 
$data = array(
    35 => '3',
    24 => '6',
    72 => '1',
    16 => '5',
    81 => '2',
);
 
$result = implode('|', array_map_associative('callback', $data));
 
var_dump($result);