Recursively removes array keys with null values.
<?php
function remove_array_nulls($data)
{
foreach ($data as $key=>$value)
{
if (is_array($data[$key]))
{
$output[$key] = remove_array_nulls($value);
}
elseif ($data[$key] || $data[$key]===0)
{
$output[$key] = $value;
}
}
return $output;
}
?>