How to get primary key of table?

Question

Is there a way to get the name of primary key field from mysql-database? For example:

I have a table like this:

+----+------+
| id | name |
+----+---         


        

Answer 1

Shortest possible code seems to be something like

// $dblink contain database login details 
// $tblName the current table name 
$r = mysqli_fetch_assoc(mysqli_query($dblink, "SHOW KEYS FROM $tblName WHERE Key_name = 'PRIMARY'")); 
$iColName = $r['Column_name'];