我想限制我的文本框numirec和1-10

Question

限制1-10不能放11,12,13,14,15等

<input type="text" onkeypress='return event.charCode >= 2 && event.charCode <= 57'></input>

Answer 1

计算数据库中的行数。如果您使用的是MYSQL数据库，则可以使用此代码：

<?php
db_connect();//class connection to the database

//query the database and count
$sql = "select * from tablename";
$res = mysqli_query($sql);
$num_rows = mysqli_num_rows($res);

//display the result
echo $num_rows;
?>

Answer 2

计算mysql行结果你可以使用mysqli_num_rows($query) 例如：

<?php

$query = mysqli_query($db, "SELECT * FROM users WHERE active = 1");

$active_users = mysqli_num_rows($query);

echo $active_users . 'Are activated on your site';

?>