题解 | #字符逆序#
字符逆序
https://www.nowcoder.com/practice/cc57022cb4194697ac30bcb566aeb47b
<?php // 注意原字符串中支持输入字符;会存在换行符,需要将回车换行符去掉 $str = fgets(STDIN); $str = str_replace(array("\r","\n"), '', $str); //$str = preg_replace("/\r\n|\r|\n/", '', $str); $len = strlen($str); $res = ''; for ($i=$len-1; $i >=0; $i--) { //$res .= substr($str, $i, 1); //$res = $res . $str[$i]; echo $str[$i]; } //echo $res;