PHP script can be embedded anywhere in the document. The PHP scripts are enclosed within <?php and ?>. A PHP script file will be stored with a .php extension. 

Each statements ends with a semicolon (;). 

Example

<html>
<head>
<title>My PHP Example</title>
</head>
<body>
<?php echo "Welcome to my first PHP page";?>
</body>
</html>

The above code when executed will produce the following output.

Welcome to my first PHP page

PHP Comments

In PHP, comments are used by a programmer to:

  • Hide a block of code.
  • Describe your code.
  • Write something for others to understand.

All comments will be skipped without executing them. PHP supports single-line and multi-line comments.

A single line comment can be specified in two ways

  • Using a # symbol  at the beginning of a line.
  • Using // at the beginning of a line.

Example

<!DOCTYPE html>
<html>
<body>
<?php
// This is an example of
# a single-line comment
//echo "This line will not be executed";
?>
</body>
</html>

This code will not produce any output because all the lines (PHP scripts) are commented.

In PHP, you can comment multiple lines by placing the content within /* and */.

Example

<!DOCTYPE html>
<html>
<body>
<?php
/* This is an example
of multi-line comment in PHP*/
echo "This line will /*not*/ be executed";
?>
</body>
</html>

The above program when executed will produce the following output.

This line will be executed