allow cross origin headers

Header set Access-Control-Allow-Origin "*" 

How to extract pages from a pdf file

use below command:

pdftk in.pdf cat 1 2 5-8 output out.pdf

installing mcrypt

sudo apt-get install mcrypt

sudo php5enmod mcrypt

apache restart

git how to discard last commit

git push origin HEAD --force

git untrack file without deleting

git update-index --assume-unchanged

nodejs using variable in function scope

use function scope

(function(v){
})
(v2);

uploading file through ajax

use jquery.form plugin

ajaxform........

debugging ajax error in jquery

error: function(err) {
  alert(err.responseText);
   },