A PHP scripting block always starts with <?php and ends with ?>. A PHP scripting block can be placed anywhere in the document.
On servers with shorthand support enabled you can start a scripting block with <? and end with ?>;.
For maximum compatibility, we recommend that you use the standard form (<?php) rather than the shorthand form.
Below, we have an example of a simple PHP script which sends the text “Learn Web Development Things” to the browser:
echo "Learn Web Development Things;;
Variables in PHP
Variables are used for storing values, like text strings, numbers or arrays.
When a variable is declared, it can be used over and over again in your script.
All variables in PHP start with a $ sign symbol.
The correct way of declaring a variable in PHP:
$var_name = value;
In PHP, a variable does not need to be declared before adding a value to it.
$txt="Learn Web Development Things";
In the example above, you see that you do not have to tell PHP which data type the variable is.
PHP automatically converts the variable to the correct data type, depending on its value. So PHP is called Loosely Typed Language
In a strongly typed programming language, you have to declare (define) the type and name of the variable before using it.
In PHP, the variable is declared automatically when you use it.