PHP - 页面刷新时重新加载新记录

Question

我的 PHP 代码和数据库有一点问题。每次刷新页面时，当我打开页面时，都会向数据库添加一个新的空行，这是什么问题？

<?php
if (isset($_POST)) {
    $con = mysql_connect("localhost","dwarfmaster","");

    if (!$con) {
        die('Could not connect: ' . mysql_error());
    }

    mysql_select_db("my_dwarfmaster", $con);

    $name = $_POST['name'];
    $release_year = $_POST['release_year'];
    $publisher = $_POST['publisher'];
    $genre = $_POST['genre'];

    $sql = "INSERT INTO gamelist (name, release_year, publisher, genre)
        VALUES
        ('$_POST[name]','$_POST[release_year]',
        '$_POST[publisher]','$_POST[genre]')";

    if (!mysql_query($sql, $con)) {
        die('Error: ' . mysql_error());
    }

    echo "1 record added";

    mysql_close($con);
}
?>

Answer 1

要检查请求方法是否为 post，请使用:

if ($_SERVER['REQUEST_METHOD'] == 'POST')

if(isset($_POST)) 始终返回 true