(Submitting it to the bug database right now too.)

Well, simply put - the mysql() call is broken. Example script at the bottom.

<script language="php">
 	function	mysql_test1()
	{
		$r = mysql("tdn_sections","select * from sections");
		echo mysql_error();
		$i=0;
		while($o=mysql_fetch_object($r))
        {
            echo    "$i : $o->url <BR>";
        }
	}
	mysql_test1();
	
	function mysql_test2()
	{
		$c = mysql_pconnect();
		mysql_select_db("tdn_sections",$c);
		$r = mysql_query("select * from sections");
		$i=0;
		while($o=mysql_fetch_object($r))
        {
            echo    "$i : $o->url <BR>";
			$i++;
        }
	}
	mysql_test2();
</script>

Output of 'mysql_test1()':
Warning: MySQL Connection Failed: Unknown MySQL Server Host 'tdn_sections' (111) in /o3dfx/work/php4/hs~mysql_tests.x on line 4
Warning: MySQL: A link to the server could not be established in /o3dfx/work/php4/hs~mysql_tests.x on line 4
Warning: 0 is not a MySQL result index in /o3dfx/work/php4/hs~mysql_tests.x on line 6

Output of 'mysql_test2()':
0 : @POLL:7 
1 : @3DSHOP 
2 : NULL 
3 : NULL 
4 : NULL 
... (correct output)

-----------------------------------------------------

MySQL table 'tdn_sections':
root:/usr/local/lib$ mysqldump tdn_sections
#
# Table structure for table 'sections'
#
CREATE TABLE sections (
  identifier varchar(20) DEFAULT '' NOT NULL,
  section blob,
  contents blob NOT NULL,
  urlname blob,
  url blob,
  added timestamp(14),
  PRIMARY KEY (identifier)
);

#
# Dumping data for table 'sections'
#

INSERT INTO sections VALUES ('tdn_fp1','tdn_fp','5','5','@POLL:7',19980618165020);
... (loads more of similar tables)


PHP.ini contents (mysql related) - NONE! 

Both functions work just fine in PHP3.