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

$array = ["one", NULL, "two", NULL, "three"];
$string = implode("-", array_diff($array, [NULL]));
echo $string;

Returns one-two-three