php - 插入、获取id、同时插入

Question

我有两个必须同时执行的 PHP 函数。我需要使用两个不同的功能，因为例如，我在应用程序中创建一门类(class)，同时为学生添加多个作业。这是我的简化代码:

function createCourse($courseName) {
    global $mysqli,$db_table_prefix; 
    $stmt = $mysqli->prepare("INSERT INTO courses (name) VALUES (?)");
    $stmt->bind_param("s", $courseName);
    $result = $stmt->execute();
    $stmt->close();
    return $result;
}

function addHomeworkToCourse($homeworkDescription) {
    global $mysqli,$db_table_prefix;
    $course = "13"; // Here comes the problem: how do I get the ID inserted in the previous function
    $stmt = $mysqli->prepare("INSERT INTO homework (course, description) VALUES (?, ?)");
    $stmt->bind_param("is", $course, $homeworkDescription);
    $result = $stmt->execute();
    $stmt->close();
    return $result;
}

以及在同一页面中创建类(class)并添加一些作业的表单:

createCourse("Maths");
addHomeworkToCourse("Resolve this equation"); // Add some homework to "Maths"

感谢您的宝贵时间! (请注意，我不是 PHP、MySQL 和英语专家)

Answer 1

$id = createCourse("Maths");
addHomeworkToCourse($id, "Resolve this equation"); 

让createCourse 返回最后插入的类(class)的id。

php.net/manual/en/mysqli.insert-id.php

这也将使 add HomeworkToCourse 方法/函数更加健壮，并且能够在各种情况下使用