获取最后插入的ID并将其用作PHP / MySQL的参数

Question

I'm very new to PHP, trying to figure things out.

I have the following php code:

$read_more = '<a href="http://www.example.com/index.php?id=' . mysqli_insert_id($conn)  . '" target="_self">[read more]</a>';

$sql = "INSERT INTO database (date, headline, article, read_more) VALUES ('$_POST[date]', '$_POST[headline]', '$_POST[article]', '$read_more')";

The code is returning "http://www.example.com/index.php?id=0". Note that the "id" parameter is returning "0". My goal is to make it return the latest ID from the database, which is set to auto increment.

I've tried many things but nothing worked for me so far. Thanks!

EDIT: After hours of trial and error, this is how I was able to solve this problem:

//After connecting to the database

$sql = "INSERT INTO table (date, headline, article, read_more) VALUES ('$_POST[date]', '$_POST[headline]', '$_POST[article]', '$read_more')";
$result = mysqli_query($conn, $sql);
$id = mysqli_insert_id($conn);

Now the latest id is saved into a variable that I can use.

Answer 1

Try something like this instead. Check the documentation here.

// insert a datarow, primary key is auto_increment
// value is a unique key
$query = "INSERT INTO test (value) VALUES ('test')";
mysql_query( $query );

echo 'LAST_INSERT_ID: ',
      mysql_query( "SELECT LAST_INSERT_ID()" ),
      '<br>mysql_insert_id: ',
      mysql_insert_id();