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I am converting some of my code from the older mysql extension to the mysqli extension in PHP. Previously, with the mysql extension, I had used some code like this to find the primary key in a table: while ($i < mysql_num_fields($result)) { $meta = mysql_fetch_field($result, $i); if ($meta->primary_key == 1){ $primary_key = $meta->name; } $i++; } $meta->primary_key == 1 was very convenient. So far I have converted to code to using mysqli: while ($i < $result->field_count) { $meta = $result->fetch_field; if ($meta->primary_key == 1){ $primary_key = $meta->name; } $i++; } Of course, from looking at the docs here we can see that $meta->primary_key doesn't exist in mysqli. I see that there is a $meta->flags . This is my best guess, although i am not sure of what value flags should be when I have a primary key. Does anyone know how I tell which column is the primary key for a table using mysqli? Thanks! EDIT Here is some working code: //get primary key $primary_key = ''; while ($meta = $result->fetch_field()) { if ($meta->flags & MYSQLI_PRI_KEY_FLAG) { $primary_key = $meta->name; } }

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