Comments in PHP

A comment in PHP code is a line that is not executed as a part of the program. Its only purpose is to be read by someone who is looking at the code.

Comments can be used to:

• Let others understand your code
• Remind yourself of what you did - Most programmers have experienced coming back to their own work a year or two later and having to re-figure out what they did. Comments can remind you of what you were thinking when you wrote the code
• Leave out some parts of your code

PHP supports several ways of commenting:

// This is a single-line comment

# This is also a single-line comment

/* This is a
multi-line comment */

Single Line Comments

Single line comments start with //.

Any text between // and the end of the line will be ignored (will not be executed).

You can also use # for single line comments, but in this tutorial we will use //.

The following examples uses a single-line comment as an explanation:

// Outputs a welcome message:
echo "Welcome Home!";

echo "Welcome Home!"; // Outputs a welcome message

Comments to Ignore Code

We can use comments to prevent code lines from being executed:

// echo "Welcome Home!";

PHP Exercises

 print("Hello World");