PHP convert nested array to single array while concatenating keys?

Question

Here is an example array:

 $foo = array(
           \'employer\' => array(
                    \'name\' => \'Foobar Inc\',
                    \'phone\         


        

Answer 1

Something like this:

function makeNonNestedRecursive(array &$out, $key, array $in){
    foreach($in as $k=>$v){
        if(is_array($v)){
            makeNonNestedRecursive($out, $key . $k . '_', $v);
        }else{
            $out[$key . $k] = $v;
        }
    }
}

function makeNonNested(array $in){
    $out = array();
    makeNonNestedRecursive($out, '', $in);
    return $out;
}

// Example
$fooCompressed = makeNonNested($foo);