OOPS Basic

  The four principles of OOP. 1. Encapsulation 2. Abstraction 3. Inheritance 4. Polymorphism Inheritance is a mechanism of acquiring the features and behaviors of a class by another class. The class whose members are inherited is called the base class, and the class that inherits those members is called the derived class. Inheritance implements… Continue reading OOPS Basic


Database Sharding

What's the difference between sharding DB tables and partitioning them? I take sharding to mean the partitioning of a table over multiple machines (over multiple database instances in a distributed database system - each having it's own replication node setup), whereas partitioning may just refer to the splitting up of a table on the same machine. So a… Continue reading Database Sharding

Laravel: Lazy Load and Lazy Eager Loading

Laravel Lazy Load If you do not need to add additional constraints to an Eloquent relationship query, you may simply access the relationship as if it were a property. For example, continuing to use our User and Postexample models, we may access all of a user's posts like so: $user = App\User::find(1); foreach ($user->posts as $post) { //… Continue reading Laravel: Lazy Load and Lazy Eager Loading

Session and Cookies

These link basically sum up session very well. It's a very trivial topic to cover but nonetheless very fundamental. Sometimes interviewers dig into these topics (mostly for freshers or less experienced applicants). The explanation is very simple and the best part is the debug part which has been copied below. https://www.quora.com/How-Session-and-Cookies-related or http://machinesaredigging.com/2013/10/29/how-does-a-web-session-work/   Why would a… Continue reading Session and Cookies

HTTP, TCP/IP and …

HTTP The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, and hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web. HTTP is an application layer protocol designed within the framework of the Internet protocol suite. Its definition presumes an underlying and reliable transport layerprotocol, and Transmission Control Protocol (TCP) is commonly used. However HTTP can be adapted to use unreliable… Continue reading HTTP, TCP/IP and …