如果数据库已经有值，但仍然获取ID，如何忽略INSERT？

I am trying to ignore an INSERT query if the two values, Answer1Text and Answer2Text are already in the database, but still get the id (called AnswerID (Primary Key) from the row? How can I do this?

My code:

$stmt = $conn->prepare("INSERT INTO answers (Answer1Text, Answer2Text) VALUES (?, ?)");
$stmt->bind_param('ss', $text1, $text2);
$stmt->execute();
$answerid = $stmt->insert_id;

Table of importance:

answers: AnswerID(PK), Answer1Text, Answer2Text

I have tried looking at ON DUPLICATE KEY UPDATE but I neither understand how to use it, nor do I think it is the right choice.

The best approach is to query your database first using a SELECT query: does the data already exist? If so, pull out the ID and use that in place of the insert ID; if not, insert a new row. You're right: ON DUPLICATE KEY UPDATE is wrong for this.