PDO插入双数据

Question

我的代码正在工作，除了它将双重数据插入数据库，例如，如果我输入john作为用户名，123输入密码，它会插入两次！ 我怎么能摆脱它？

<form method="POST">
    <input type="text" name="username" placeholder="username"><br />
    <input type="password" name="password" placeholder="password"><br />
    <input type="submit">
</form>

<?php
    if (isset($_POST['username'], $_POST['password'])) {
        require 'core/connect.php';

        $query = dbConnect()->prepare("INSERT INTO users (username, password) VALUES(?,?)");

        $query->bindParam(1, $_POST['username']);
        $query->bindParam(2, $_POST['password']);
        $query->execute();

        if ($query->execute()) {
        echo 'Thank you! you may now log in <a href=\'index.php\'>here</a>';
        } else {
        echo 'Please go back, something was wrong.';
        }
    }
?>

Answer 1

你跑两次

$query->execute();

if ($query->execute()) {

省略第一行

所以你留下来：

if (isset($_POST['username'], $_POST['password'])) {
    require 'core/connect.php';

    $query = dbConnect()->prepare("INSERT INTO users (username, password) VALUES(?,?)");

    $query->bindParam(1, $_POST['username']);
    $query->bindParam(2, $_POST['password']);

    if ($query->execute()) {
        echo 'Thank you! you may now log in <a href=\'index.php\'>here</a>';
    } else {
        echo 'Please go back, something was wrong.';
    }
}