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;
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