introduction to php

letskillsup

what is php

PHP is a :

  • object-oriented
  • interpreted
  • open source
  • secured
  • server-side
  • scripting language
  • which was created by Rasmus Lerdorf in 1994
  • used to manage the dynamic content of the website.

the acronym of PHP is "PHP-hypertext preprocessor".

There are two types of scripting languages:

  • client-side scripting language
    • client-side programming is also the name of the entire program that runs on the client browser. generally used for validations of forms in the websites.
    • like javascript or VBScript, etc.

  • server-side scripting language
    • programs written by server-side scripting languages run directly on the server and then return the HTML document to a client as output.
    • these types of languages are used to create dynamic websites.
    • like PHP, java, python, etc.

 uses of php in web development:

  • CMS
  • MAIL SERVER
  • CHATTING SYSTEM
  • FILE STORAGE SYSTEMS
  • E-COMMERCE WEBSITE
popular websites created using PHP:
  1. facebook
  2. yahoo
  3. wordpress
  4. mailchimp
  5. flipkart

what you need to use PHP:

  1. server
    • online using hosting 
    • offline using wamp or xampp
  2. text editor
  3. web browser

PHP must be saved whether it contains HTML tags or not in the web folder of your server:

filename.php


syntax of PHP:

  • PHP file  with only PHP code
<?php

//statement

?>

or
  • php code HTML tags:

<html>
            <head>
                        <title></title>
            </head>
<body>
                <?php

                ?>
</body>
</html>


how to run the PHP code:


  1. run the xampp
  2. start apache
  3. start MySQL
  4. open text editor: notepad
  5. create a project folder in c=>xampp=>htdocs
  6. save the file as filename.php in htdocs
  7. type the code
  8. open the browser and type localhost/project_folder_name


how to show output in PHP:

there are generally some ways to print the data:
  1. echo
  2. print
note:
  1. echo is recommended because it supports multiple arguments and is also faster than print.
  2. concatenation is performed by using "." between two strings.


how to run php code in online mode:
create inifinityfree account
login
account selection
control panel
file manager
htdocs
create php file and type the code
save
then open the new tab and type the website name













1 Comments