Function Array Dereferencing in PHP 5.4

In my previous post i have discussed new features of PHP 5.4 such as concept of Traits and shorter syntax of array.

In this post i’ll discuss the concept of function array dereferencing which is introduced in PHP 5.4. In simple words function array dereference means when array is returned, pick the value directly from it.

Difference Between Undefined and Null Value in Javascript

What’s the difference between an undefined and null value in Javascript. If you are new to  Javascript, probably you will find difficulty in understanding the difference between undefined and null value. How to check whether a variable is undefined or null.