How to comment out for a while HTML, CSS or PHP, JS code. Comments in HTML, CSS, PHP Unsullied comment php

Comments in PHP are similar to comments used in HTML. In PHP syntax, comments always begin with a special sequence of characters and all text that appears between these special characters will be ignored by the interpreter.

In HTML, the main purpose of a comment is to serve as a note to developers who can view your site's source code. PHP comments differ in that they will not be displayed to visitors. The only way to see PHP comments is to open the file for editing. This makes PHP comments useful only for PHP programmers.

In case you have forgotten or did not know how comments are made in HTML, see the example below.

Php comment syntax: single line comment

While html has only one kind of comment, PHP has two. The first type we will discuss is the single line comment. That is, a comment that tells the interpreter to ignore everything that happens on this line to the right of the comments. To use this comment, use the characters "//" or "#" and all text on the right will be ignored by the PHP interpreter.

Psst ... You can "t see my PHP comments!"; // echo "nothing"; // echo "My name is Humperdinkle!"; # echo "I don" t do anything either ";?\u003e

Result:

Hello World! Psst ... You can "t see my PHP comments!

Note that several of our echo commands were not processed because we commented them out with comment special characters. This type of comment is often used to quickly write down complex and confusing code, or to temporarily remove a line of PHP code (for debugging).

Php comment syntax: multiline comment

Like HTML comments, PHP multi-line comments can be used to comment out large blocks of code or to write comments across multiple lines. Multiline comments in PHP start with "/ *" and end with "* /". Anything between these characters will be ignored.

Result.

25.04.2017

Hello!
Let's keep learning PHP basics from scratch!
In this tutorial I will tell you what a comment is in PHP and in practice we will try to write our comment in the code. But that is not all. I also want to tell you how to comment out the code and why it should be done at all.

What is a comment inPHP
Comment inPHP- this is a php developer's tip for quick navigation in the code, as well as for edits.

The comment in PHP is not visible to the user who opened the web page for viewing. Even if the user decides to look at the source code of the page, the comment will still not be visible, since all php.

PHP code comment

There are 2 kinds of comments for PHP code:

-\u003e one line
→ multiline

⇒ Single line comment for PHP
For a one-line comment, use the symbols "//" or "#"

After these characters, everything written on one line will be ignored and considered as a comment.

Subscribe to update "; # subscription (this is a comment)?\u003e

Subscribe to update

⇒ Multi-line comment for PHP
Multi-line comments for PHP start with "/ *" and end with "* /".
Anything between these characters will be ignored and treated as a comment.
A multi-line comment is used if there are multiple lines in the record.

On the screen, you will only see the following text:

Hello blog readers - site !!!

P.S .: Always comment out your code. If you think that you will remember everything you did in the code in 1-2 years, you are wrong, the chance is very small. Even if you remember, you will have to spend a lot of time studying what, where and why ...
Make the future pleasant for yourself - comment out the code and then you will say to yourself "THANKS !!!".
Leave a comment in the code, it will take 1 minute, but it will save you a whole day in the future.

Comment out PHP code

Let's say you wrote php code, but for some reason you need to remove 2 lines from the code.
I am in no hurry to remove something from the code, especially if it is php code, I would rather comment it out. What if you need to return the code. It's easier to uncomment than to write the code in a new way.

How to comment out the code inPHP
An example with a one-line comment:

Subscribe to the update ";?\u003e

An example with a multi-line comment.

In this lesson, I will talk about how comments in HTML, CSS, PHP... Comments are text that is not visible on the web page. They are used for all sorts of explanations, reminders, descriptions for webmasters, which allows you to structure the document. Comments are indispensable when debugging code, they allow you to quickly navigate the markup of a web page and find the block you need. Comments are often used to debug HTML code. For example, you can temporarily comment out a specific block of code so that it does not run, and if necessary, it can be easily restored.

HTML comments

In HTML, comments are formed using symbols:... Thus, any text between these symbols is a comment. Let's consider an example:

Example HTML Comments

CSS comments

CSS comments are created using the symbols: / * and * /. To create a comment, you just need to place the web page code between these symbols:

/ * Beginning of a block with styles for Body * / body (background: #efeded; font-family: Verdana, Helvetica, sans-serif; font-size: 12px; margin: 0px; padding: 0px;) / * End of a block with styles for Body * /

PHP Comments

PHP comments can be single-line or multi-line:

1) Single line comments in PHP are created using the symbols: //. You just need to put this symbol in front of the line and it will be commented out. This option is used when the comment consists of only one line.

2) To implement multi-line comments, the following symbols are used: / * and * /. This option is useful if the comment spans multiple lines.

Thus, we have learned to do

From the author: commenting is one of those features that is easy to implement. At the same time, these editing elements can be of great benefit to developers who pass code from hand to hand. Today you will learn how to comment out a block in PhpStorm. We will also consider the rest of the development environment functionality for commenting the program contents.

Comments: good and bad

Code commenting is available in most programming languages \u200b\u200b(possibly all, but with varying degrees of availability). Typically, verbal explanations are used to help other team members with further development, or simply to remind ourselves that this area needs fixes (“FIX ME”).

Of course, an explanation of what is written is a blessing. But with the help of comments, you can also cross out all the good aspects of the code. To prevent this from happening, it is necessary to distinguish between the types of comments:

documenting. A good association would be the concept of documentation for various software. Such comments help you to use the code like an instruction. Such commenting is not perceived as superfluous, because there is nothing without it. Imagine that someone has used an authoring framework and does not tell you how to use the program;

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explaining. Good code usually doesn't need them. The more lines of comments you see in a program, the more likely the program is poorly written. Of course, this is not an absolute rule.

Explanatory comments can be useful for those who will fix the code in the future. For example, many young professionals see a field for improvement everywhere. They believe that things were worse before them, and now it's time to fix every single feature.

Sometimes a similar feeling overwhelms professionals. For example, when everything looks surprisingly crooked, there must be a better solution. To save followers from looking for the best, the programmer can leave a note like this: # time_spent_here \u003d 24h

After such words, few people want to spend so much time. Thus, you are warning that many different options have already been sorted out. At the same time, you should avoid such attacks: #i_hate_this, # try_to_do_better_ass %% le. In this way, you are only showing an unprofessional attitude. Don't compromise yourself and your employer.

But documenting code commenting can also become a ballast for the programmer. As a rule, these are massive sections that distract directly from programming. But to display the code without comments, the main IDEs have a corresponding function. PhpStorm should be no exception, but alas. Look for the feature in the update docs.

Tag as a functional element

While commenting is intended to be an explanation and aid for team development, these features are not used as often. As a rule, tags are placed where they want to stop the execution of the code. Let's say you have PHP embedded in HTML. And you don't want to erase it, you just want to see how the page looks without it. To do this, you must follow the following syntax:

JavaScript

…

As you can see, with simple actions, you can stop the execution of the code without even performing any complex operations. But, in fact, this is not the height of optimization yet. The phpStorm IDE itself provides additional convenience for the developer. With the help of highlighting and keyboard shortcuts, you can comment out the selected segment of code without attaching specialized tags. This can be done as follows.

Using a method convenient for you, select a fragment of text (mouse, shortcuts).

Press the keyboard shortcut Ctr + Shift + /

In addition, you can comment on the current line. Everything is the same, only without Shift.

The advantage of this type of commenting is the simultaneous coverage of multiple languages. PHP is rarely on its own. This way you don't have to resort to tagging each one. The environment supports several more web languages. Just select a fragment and sell the combination - that's the multilingual code and commented out. In the same way, it can be made active.

That's all for us. If you haven't used these features before, we advise you to get started. Abbreviations make work faster and better.

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