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There are currently no methods available in the Arr class to do this, so you'll have to code up your own method for doing this.

Are these arrays indexed or assoc?

Here you go...

// return the key or value before whatever is in $current
public function previous($array, $current, $use_key = false)
{
    // we'll return null if $current is the first in the array (there is no previous)
    $previous = null;

    foreach ($array as $key => $value)
    {
        $matched = $use_key ? $key === $current : $value === $current;
        if ($matched)
        {
            return $previous;
        }
        $previous = $use_key ? $key : $value;
    }

    // we'll return false if $current does not exist in the array
    return false;
}

// return the key or value after whatever is in $current
public function next($array, $current, $use_key = false)
{
    $found = false;

    foreach ($array as $key => $value)
    {
        // $current was found on the previous loop
        if ($found)
        {
            return $use_key ? $key : $value;
        }
        $matched = $use_key ? $key === $current : $value === $current;
        if ($matched)
        {
            $found = true;
        }
    }

    if ($found)
    {
        // we'll return null if $current was the last one (there is no next)
        return null;
    }
    else
    {
        // we'll return false if $current does not exist in the array
        return false;
    }
}