[PHP] how to iterate over fields names with mysql_fetch_assoc

[grahama]

How do I iterate over fields when I perform the below script:
each row has: artist_name,urlPath,biography as fields
while ($row = mysql_fetch_assoc($result))
{
# if the current field name  is 'artist_name', do something
switch($GetCurrentFieldNameintheCurrentRow)
 {
        case $row[ 'field name is now: artist_name']
        //do something
        break;
 }
If I write the below code, I only get the first field name of each 
row...which makes sense
In this case, I get 'artist_name'

while ($row = mysql_fetch_assoc($result))
        {
        $fieldName= key($row);
        echo 'fieldName is: '.$fieldName."\n";
        }
many thanks :)
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