php 换行 空格分割处理

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<?php     function parse_specification($specification){         $rt=array();         $lines=array_filter(preg_split("/[\n]/",$specification));         foreach($lines as $line){             $fields=array_filter(preg_split("/[\s]+/",$line));             if(count($fields)>1){                 $rt[]=array('k'=>array_shift($fields),'v'=>join(' ',$fields));             }         }         return $rt;     }     $specification = trim($product['specification']);     if(!empty($specification)){         $specification = parse_specification($specification);     } ?>