How can I implode an array while skipping empty array items?

Question

Perl\'s join() ignores (skips) empty array values; PHP\'s implode() does not appear to.

Suppose I have an array:

$array = a         


        

Answer 1

How you should implement you filter only depends on what you see as "empty".

function my_filter($item)
{
    return !empty($item); // Will discard 0, 0.0, '0', '', NULL, array() of FALSE
    // Or...
    return !is_null($item); // Will only discard NULL
    // or...
    return $item != "" && $item !== NULL; // Discards empty strings and NULL
    // or... whatever test you feel like doing
}

function my_join($array)
{
    return implode('-',array_filter($array,"my_filter"));
}