<?php function compound(array $arr) { $cache=array(); $rst=""; foreach($arr as $v) { if(empty($cache) || $v==end($cache)+1) { $cache[]=$v; } else { if(!empty($rst)) $rst.=","; if(count($cache)>2) $rst.=reset($cache)."-".end($cache); else $rst.=implode(",",$cache); $cache=array($v); } } if(!empty($rst)) $rst.=","; if(count($cache)>2) $rst.=reset($cache)."-".end($cache); else $rst.=implode(",",$cache); return $rst; } echo compound(array(1,2,3,5,6))."\n"; // gets "1-3,5,6" echo compound(array(1,3,4,5,6)); // gets "1,3-6"
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