This error occurs when you use jquery and a form input element such as button with id or name as "submit"
We can remove non printable characters in string by using preg_replace function in php, It's quite simple.
This simple function will return number of days for given month in php
wget is a very handful utility to download files over the internet. It can handle most of the scenarios like background download,multiple downloads,non interactive downloads etc.
wget command useful to download files. Sometimes we needed to write wget output to file which can be verified later if there is any issues in downloading that file.
CSS Shadow can be used to project a div with 3D like effect. Most of the times we shadow bottom & left / bottom & right side to bring this effect. Sometimes we thought to shadow on all sides of div to give it a different look.