(11) object mysql_fetch_field(int result [,int col_num]).
返回结果集中给定列的相关元数据信息，如果没有这样的列，则返回假。如果省略col_num，则对mysql_fetch_field()的后继调用返回结果集后续列的信息。如果不再有剩余的列。则返回值为假。如果指定了col_num，则其取值范围为0到mysql_num_fields()-1。在此情况下，mysql_num_fields()返回给定列的相关信息，如果col_num超出范围，返回假。
$link=mysql_pconnect("localhost","sunsoft","suixiang") or die("Could not connect").
mysql_0select_db("stamp_db") or die("Could not 0select database").
$query="SELECT * FROM president".
$result=mysql_query($query) or die("Query failed").
for($i=0.$i{
printf("information for column %d:
",$i).
$meta=mysql_fetch_field($result).
if(!$meta)
{
print("No information available
").
continue.
}
print("
").
printf("blob: %s
",$meta->blob).
printf("max_length: %s
",$meta->max_length).
printf("multiple_key: %s
",$meta->multiple_key).
printf("name: %s
",$meta->name).
printf("not_null: %s
",$meta->not_null).
printf("numeric: %s
",$meta->numeric).
printf("primary_key: %s
",$meta->primary_key).
printf("table: %s
",$meta->table).
printf("type: %s
",$meta->type).
printf("unique_key: %s
",$meta->unique_key).
printf("unsigned: %s
",$meta->unsigned).
printf("zerofill: %s
",$meta->zerofill).
print("
").
}
?>