PHP/SQL 简单点击计数器按钮

Question

试图制作一个简单的点击计数器，但没有用。我的垃圾代码有什么问题？

addLike.php

 <?php

$requestLikes = "SELECT Likes FROM test1";
$Likes = mysql_query($requestLikes);

$insertToLikes = "INSERT INTO test1 (Likes) VALUES (" . $Likes + 1 . ")";
mysql_query($insertToLikes);
$Likes = mysql_query($requestLikes);

?>

HTML

    <button action="/DEMO/PHP/addLike.php" method="post">Yeet
    </button>0

    <?php 
    echo '<h1>' . $Likes . '</h1>'; 
    ?>

结果

www.mySite/DEMO/PHP/addLike.php

Fatal error: Uncaught Error: Call to undefined function mysql_query() in /storage/ssd4/786/4680786/public_html/DEMO/PHP/addLike.php:4 Stack trace: #0 {main} thrown in /storage/ssd4/786/4680786/public_html/DEMO/PHP/addLike.php on line 4

是的，我已经建立了到数据库的连接 编辑:不要介意按钮标签后的随机“0”

Answer 1

 <?php
$conn = mysqli_connect("127.0.0.1", "my_user", "my_password", "my_db");

$requestLikes = "SELECT Likes FROM test1";
$LikesQ = mysqli_query($conn, $requestLikes);
$Likes = mysqli_fetch_array($LikesQ);
$x = $Likes[0] + 1;
$insertToLikes = "INSERT INTO test1 (Likes) VALUES ('$x')";
mysqli_query($conn, $insertToLikes);
$y = mysqli_query($conn, $requestLikes);
$output = mysqli_fetch_array($y);
echo "<h1>$output[0]</h1>";

?>

请使用MYSQLI

$insertToLikes = "INSERT INTO test1 (Likes) VALUES (" . $Likes + 1 . ")";

您容易受到 MySQL 注入(inject)攻击，请始终使用准备好的语句 或 mysqli_real_escape_string