PHP Errors

Hi David,

I have noticed I am staring to receive a few PHP errors appearing in my error.log file
Example is below.

[13-Oct-2010 18:23:27] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/beauty/public_html/includes/database.php:21) in /home/beauty/public_html/html/header.php on line 14
[13-Oct-2010 18:23:28] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/beauty/public_html/includes/database.php:21) in Unknown on line 0
[13-Oct-2010 18:23:28] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/beauty/public_html/includes/database.php:21) in Unknown on line 0
[13-Oct-2010 18:33:13] PHP Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/beauty/public_html/includes/database.php on line 21
[13-Oct-2010 18:33:13] PHP Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/beauty/public_html/includes/database.php on line 26
[13-Oct-2010 18:33:13] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/beauty/public_html/includes/database.php:21) in /home/beauty/public_html/html/header.php on line 14
[13-Oct-2010 18:33:14] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/beauty/public_html/includes/database.php:21) in Unknown on line 0
[13-Oct-2010 18:33:14] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/beauty/public_html/includes/database.php:21) in Unknown on line 0
[13-Oct-2010 18:46:17] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 78 bytes) in /home/beauty/public_html/includes/database.php on line 21

I used o get the header already sent when I had white space in config but htis is ok now. Any ideas what else might be going on here?

Thanks
Richard