Introduce with PHP Hello World and Variable

PHP follows a structure to write php code. If we want to write php code then we should write "<?php .......... ?>" . The php code is included in this script of php. If we are using only php code for this file it's not necessary to close "?>" this script.

To print something in php we should write "echo". echo is predefined php function which is features is to print something in php.

        <?php 

     

                  echo "Hello novice developer";

              ?>   

PHP Variable : 

Variable is name  given to the memory location.It can be changed.

 Writing condition of PHP Variable

• In php variable name must be start with a dollar ($) sign   

           i.e , I want a variable named x then I can write 

           $x  = is write syntax and

            x = is wrong syntax

• First charecter must be underscore or letter

           i.e,     $x , $X  and $_x is all are ok .

• Variable name case sensitive 

           $ABC and $abc is not equal 

        <?php 

                              $x;

                              $x = 10;

                              echo $x;

              ?>