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@ 2014-10-29T16:17:49Z

<?php
function group_nums($array) { 
   $ret  = array(); 
   $temp = array(); 
   foreach($array as $val) { 
      if(next($array) == ($val + 1)) 
         $temp[] = $val; 
      else 
         if(count($temp) > 0) { 
            $temp[] = $val; 
            $ret[]  = $temp[0].'-'.end($temp); 
            $temp   = array(); 
         } 
         else 
            $ret[] = $val; 
   } 
   return $ret; 
} 
$a = [2,3,4,7,8,9,10,11,13,15];
print_r(group_nums($a));

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
end: documentation ( source)
next: documentation ( source)

preferences:dark modelive preview

35.9 ms | 402 KiB | 5 Q