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Because of how PHP is structured, which is to say it is done so that anyone can use it according to their own style, developers don't have to make use of PHP comments. But the truth is, most professional web developers, if not all, stress that making use of comments in PHP is vital in keeping organization and improving readability for future use. PHP comments may only be seen by developers, since the PHP engine doesn't pay attention to remarks declared as comments. This is quite handy for developers, who can make visible notes on their source code all while the visitor to the webpage is kept in the dark about any such comments. Unlike HTML comments, PHP comments aren't even visible in the source code of a website. HTML comments are visible to the general public, which can potentially lead to the stealing of code or may even help hackers exploit applications. PHP comments aren't output to the browser at all, so they are completely safe from prying eyes. Comments are created with three different calls. For comments that span two or more lines, we have to use "/*" and "*/" - and "#" or "//" for single line comments. Comments in PHP can actually be placed directly after real PHP code, above it, or below it. This leaves a lot of creativity in how developers document their code according to their style and tastes. Unbeknown to most, PHP comments can also be used for more practical scenarios, such as troubleshooting. Expert programmers will find they have a problem with their application, and comment out different blocks of code to see what is causing the error. While it is usually in new code blocks, this method will indeed show that sometimes the problem is due to program code interacting wrong, which can in effect mean the problem is anywhere in the application. Commenting in PHP is also great to use in selection structures, since PHP has long been known as a hard to scale language. Once files start getting big, it can be dizzying to try and remember which loops and selection structures go where, and what they do. By commenting out every closing bracket, and what it is in relation to, the problem is easily fixed. This is often mandatory for programmers who work for employers. Closing Comments In the end, there is a lot to gain from using PHP comments. They are quite functional for saving time, and also serve their purpose in troubleshooting. For more information on the idea of using comments effectively, check out local bookstores and online resources for more material.
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