Im using PHP 4.0.6 install on Solaris x86 with mysql 3.23.39.  The following code produces causes mysql_query to return false, but the database update works!

$query .= "WHERE User_Name = '$User_Name[$i]'" ;
    $sth = mysql_query($query) or die ("<p>ERROR: Update Query Failed<p>$query<BR>") ;
    if ($verbose) {
        print ("$query<BR>");
    }

Here is the error message generated by the code:
ERROR: Update Query Failed
UPDATE Padmin SET Full_Name = 'Corin Cody', Admin = 1 WHERE User_Name = 'ccody'

I was recieving the following warning from the code above until I changed error_reporting = E_ERROR
Warning: MySQL: Unable to save result set in /usr/www/netsite-docs/parda.actionwebservices.com/public-html/includes/admin_user_write.php on line 26

Here are my PHP build options:
CC=gcc OPTIM="-O2" EXTRA_LIBS=/usr/local/lib LIBS=-lz ./configure  --with-apxs=/usr/local/httpd/bin/apxs --with-mysql=/usr/local/mysql/ --with-png-dir=/usr/local/lib/libpng.so.2 --with-imap=/usr/local/lib --with-lz=/usr/local/lib