PHP

• PHP stands for Hypertext Preprocressor
• PHP is an object oriented server side scripting language
• We an executes the PHP code only on server side
• Hypertext is text that links to other information(text)
• By clicking on a link ( hyperlink ) in a hypertext document, a user can quickly jump to different content..

How PHP code executes ?

• A Preprocressor is a progarm that processes its input data to produce output that is used as input to another progarm

• Common Gateway Interfacing --> PHP Interpreter --> Preprocressor .php file <--> Apache Server --> Internet --> Client

Advantages of PHP

• PHP Application can runs varioud platform

• Learn to easy because its syntax is very similar to C program

• Response and speed of executions of program is fast

• It can interact with many different database language including MySQL

  what is variable ?

  • variable is a storage location that can ber modified at any time
  • In programming,variable is memory locations
  • We can store number, text,file or images path etc..
  • In Php,variable should start with $ symbol

     
   E = m (c square)
   Here m is variable
   m = 5kg,10kg,15kg..
  

Variable Declaration

• Should start with $ sign
• Should start letter or underscore after the $ sign
• Should not start with number
• We can use alpha-numeric characters and underscore

ex:

$name = "Nisha";
$_mobile = 9876543210;
$ image_path1 = "C:/images/1.jpg";
$pass = "Mypass@1234";