Bugfix PHP Notices Undefined variable / index
$_REQUEST[modname] => $_REQUEST['modname']
Concatenate variables in SQL statements
Format long SQL statements for readability
Add translation for Sales
replace double quotes by simple ones (echo)
IE8 compatibility fixes

IE8 HTML5 tags fix
.focus()
Replace event by e
Remove inline CSS + indent HTML + rework Side HTML
json_encode + htmlspecialchars ENT_QUOTES

http://stackoverflow.com/questions/168214/pass-a-php-string-to-a-javascript-variable-and-escape-newlines
Counting Loops with pre calc count()

http://www.phpbench.com/
Counting Loops with pre calc count()

http://www.phpbench.com/
Modify loop: use for instead of foreach

http://www.phpbench.com/
Open menu + sel menu link transferred to warehouse.js
include homogenize
Place Javascript in Warehouse footer + remove *_once
Inline HTML
SELECTED="SELECTED" => SELECTED
Variables out of string
Variable Type Checking: check isset before is_array

http://www.phpbench.com/