How do you create a one-line comment in PHP?

In PHP, creating a one-line comment is typically done using the double forward slash syntax, which is represented by "//". When you use this syntax, everything following the "//" on the same line is treated as a comment and will not be executed as part of the PHP script. This method is widely used for inserting brief annotations or remarks within the code, allowing developers to explain or clarify specific parts of their code without affecting its execution.

The other options represent different styles of comments that PHP supports. The "/* comment */" syntax is used for multi-line comments, allowing you to comment out blocks of code across multiple lines. The "#" symbol can also be used for single-line comments but is considered less common in practice than the "//". Understanding these various commenting styles is important for PHP developers, as they allow for effective code documentation and clarity within the codebase, but for the specific requirement of creating a single-line comment, "//" is the correct and most prevalent way to do so in PHP.