<?php 

     $maxLine = 4; //每排人数

$no = 17;//学生编号

$line=ceil($no/$maxline);

$row=$no%$maxline?$no%$maxline:$maxline;

echo "编号<b>".$no."</b>的座位在第<b>".$line."</b>排第<b>".$row."</b>个位置";

?>

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编号17的座位在第0排第个位置