A compiler is a computer program that accepts programs written in high level language and produces an object program.

Flyspray is an uncomplicated, web-based bug tracking system written in PHP for assisting with software development. It was originally conceived when the Psi Jabber client project couldn't find a bugtracker that suited their needs, and has been made available for everyone to use for their own projects.

Open-source software (software with open source code) has become very popular in the last few years and is advancing at a speed unknown outside the world of IT.

Definition:  An exception is an event, which occurs during the execution of a program, that disrupts the normal flow of the program's instructions.

When an error occurs within a method, the method creates an object and hands it off to the runtime system. The object, called an exception object, contains information about the error, including its type and the state of the program when the error occurred. Creating an exception object and handing it to the runtime system is called throwing an exception.

We can use PHP rand() function for showing the random data from database or from a list or directory.This code is used for showing the random images from a directory based on page refresh.Create A Page and paste below code in that.Create an image folder and place images in that which you want to show randomaly.Both images and code file should be in same folder.You can change code as per requirements.You can see working demo on http://www.indiapoly.com.