Put the .php block before that

location ~ ^/phpmyadmin/(.*\.php)$ {
alias /home/httpd/html/phpmyadmin/$1;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
include fcgi.conf;
fastcgi_param SCRIPT_FILENAME $request_filename;
}

location ~ ^/phpmyadmin($|/.*) {
alias /home/httpd/html/phpmyadmin$1;
index index.php index.html index.htm;
auth_basic "Restricted";
auth_basic_user_file /home/httpd/html/phpmyadmin/.htpasswd;
}


http://pastebin.com/m6de995ae