Converting array elements into range in php

Question

I’m working on an array of numeric values.

I have a array of numeric values as the following in PHP

11,12,15,16,17,18,22,23,24

And

Answer 1

You could do it like that:

$numbers = [11,12,15,16,17,18,22,23,24];
$ranges  = [];
$start   = $end = current($numbers);

foreach($numbers as $range){
    if($range - $end > 1){
        $ranges[] = ($start == $end) ? $start : $start . "-" . $end;
        $start    = $range;
    }
    $end = $range;
}
$ranges[] = ($start == $end) ? $start : $start . "-" . $end;