Lecture # 3 Comments:-

Commenting in PHP

A Comment is a Programmer's Readable Explanation or Annotation in the Source Code of a Program. They are added with the purpose of making the Source Code Easier for Humans to understand, and are generally ignored by Compilers and Interpreters.

Uses

Planning and Reviewing
Code Description
Algorithmic Description
Resource inclusion
Metadata
Debugging
Automatic Documentation Generation
Syntax Extension
Stress Relief





There are two commenting formats in PHP -


1. Single Line Comments
2. Multi Line Comments



Single-line Comment

They are generally used for short Explanations or notes relevant to the local code. Here are the examples of single line Comments.

<?php

     # This is a comment, and
     # This is the second line of the comment 

     // This is a comment too. Each style comments only print 
         "An example with single line comments"; 

?>

Multi-lines Comments

They are generally used to provide pseudo code algorithms and more detailed explanations when necessary. The multi line style of commenting is the same as in C. Here are the example of multi lines comments.

<?php

     /*  This is a Comment with multi line 
          Author : Mohammad Usman 
          Purpose: Multiline Comments Demo 
          Subject: PHP  */ 
     
          print "An example with multi line comments"; 

?>

Comments

Post a Comment

Popular posts from this blog

Differences

Image
Differences between constants and variables are as fallow:- There is no need to write a dollar sign ($) before a constant, where as in Variable one has to write a dollar sign. Constants cannot be defined by simple assignment, they may only be defined using the define() function. Constants may be defined and accessed anywhere without regard to variable scoping rules. Once the Constants have been set, may not be redefined or undefined.
Read more

Uses of PHP

PHP performs system functions, i.e. from files on a system it can create, open, read, write, and close them. PHP can handle forms, i.e. gather data from files, save data to a file, through email you can send data, return data to the user. You add, delete, modify elements within your database through PHP. Access cookies variables and set cookies. Using PHP, you can restrict users to access some pages of your website. It can encrypt data.
Read more

What is PHP?

Image
PHP is a Programming language that is freely available and used primarily on Linux web server, originally derived from “PERSONAL HOME PAGE” now stands for PHP is “Hypertext Preprocessor” that allows web developers to create dynamic content that interacts with database. PHP is basically used for developing web based software applications. 
Read more