Differences

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.

Comments

  1. Kamila31 January 2019 at 01:56

    Nice site....Please refer this site also Our vision success!Training are focused on perfect improvement of technical skills for Freshers and working professional. Our Training classes are sure to help the trainee with COMPLETE PRACTICAL TRAINING and Real time methodologies
    Dot Net Training Institute in Chennai
    Selenium Testing Training in Chennai
    Software Testing Coaching institute in Chennai
    Java Training Institute in Chennai
    PHP Course in Chennai

    ReplyDelete
  2. Xplore IT Corp14 June 2019 at 03:54

    Hi, thanks for your blog, if you want to learn about programming languages like java, php, android app, embedded system etc. I think this training institute is the best one.
    best python training in coimbatore
    Android training in coimbatore
    Networking training in coimbatore

    ReplyDelete

Post a Comment

Popular posts from this blog

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

Constants

Image
A Constant is a name or an Identifier for a simple Value. A Constant value cannot change during the Execution of the Script. By default, a constant is case sensitive. By convention, constant identifiers are always uppercase. A constant name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. If you have defined a constant, it can never be changed or undefined. To define a constant you have to use define() function and to retrieve the value of a constant, you have to simply specifying its name. Unlike with variables, you do not need to have a constant with a $. You can also use the function constant() to read a constant's value if you wish to obtain the constant's name Dynamically. constant() function As indicated by the name, this function will return the value of the constant. This is useful when you want to retrieve value of a constant, but you do not know its name, i.e. It is stored in a variable or returned by a f...
Read more