关于mysql：PHP将值插入两个表中并将这些表中的键插入链接表中

PHP Insert values into two tables and insert keys from those tables into link table

我是PHP的新手，我感兴趣的是在链接表中的两个表中添加值之后，将两个表的主键ID(称为sub_credits(插入submit_id和credits_id))添加为外键，以此作为外键。任何帮助将是巨大的！这是我的代码：

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//write the data to the database
$query1 ="INSERT INTO submissions (user_id, date," .
"submission_type, title, zipfile," .
"copyright, review)" .
"VALUES ('" . $_SESSION['user_id']."', NOW()," .
"'$submission_type', '$title'," .
"'$zipfile', '$copyright', '$review' )";
$query2 ="INSERT INTO credits (credits) VALUES ('$credits')";
mysqli_query($dbc, $query1)
or die ('Data not inserted.');
mysqli_query($dbc, $query2)
or die ('Data not inserted.');