I am using php-3.0.12-6 with Redhat Linux 6.1 Kernel 2.2.12-20 and installed by rpm.
And I using this script to test and return error: 
'Fatal error: Call to unsupported or undefined function mysql_connect()':

<?php

    $link = mysql_connect ("127.0.0.1", "root", "")
        or die ("Could not connect");
    print ("Connected successfully");
    mysql_close ($link);

?>

So I try to test on next machine using php-4.0.1pl2 (default installed) with Redhat Linux 7.0 Kernel 2.2.16, and it run fine.

Follow is the MySQL section at /etc/httpd/php3.ini,

[MySQL]
mysql.allow_persistent = On ;
mysql.max_persistent = -1 ; 
mysql.max_links	= -1 ;
mysql.default_port =	; 				
mysql.default_host =	;
mysql.default_user =	; 
mysql.default_password	=    ; 

I would too much thanks for you if you can help me out for now I feel upset I stop at this point I cannot continue my web job. Thanks thanks thanks.