<?php echo "Hello World";?>

Output: Hello World

Explanation:

A PHP script starts with <?php and ends with ?>

In PHP there are two basic ways to get the output: echo and print.

<?php print "Hello World";?>

Output: Hello World

What is difference between echo and print?

The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters while print can take one argument. echo is marginally faster than print.

“Hello world!” : is a string (sequence of characters).

Note: PHP statements end with a semicolon (;).