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<?php function lookandsay($str){ $r = ''; $m = $str[0]; $n = 1; for($i=1; $i<strlen($str); $i++){ if($str[$i] == $m){//如果这个字符与上个字符相同则数目加1 $n++; }else{ $r .= $n.$m;//反之,把数目和这个字符追加到返回值 $m = $str[$i];//赋值下一个字符 $n = 1; } } return $r.$n.$m; } for($i = 0,$str = 1; $i < 9; $i++){ $str = lookandsay($str); print $s."<br/>"; } ?>