67 lines
1.4 KiB
Markdown
67 lines
1.4 KiB
Markdown
---
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title: PHP Syntax and Comments
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---
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## PHP Syntax
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The structure of a PHP document may look something like:
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```php
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<?php
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// Your PHP code goes here.
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```
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**NOTE:** When creating a document with only PHP, the closing tags (see below) should be omitted.
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When placing PHP in an HTML document, a closing tag is needed, like so:
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```php
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<?php
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// Your PHP code goes here.
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?>
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```
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**NOTE:** Shorthand syntax is also available, but should be avoided to reduce unwanted behavior.
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A PHP file may have HTML tags and / or JavaScript.
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The default file extension for PHP files is `.php`.
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## Indentation
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While this is mostly personal preference, it is most common to see the lines within the <?php / ?> tags at the same level, like so:
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```php
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<?php
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// Same level of indendation.
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// Not indented like so.
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```
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## How to make comments in PHP?
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A comment in PHP code is a line that is not executed as part of the program. Its only purpose is to be read by someone who is looking at the code.
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In PHP, comments can be make by two ways — either single-lined or multi-lined.
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This can be seen in the example below:
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```php
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<?
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// This is a single-lined comment.
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/**
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* This is a multi-lined comment block
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* that spans over multiple
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* lines.
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*/
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```
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## Additional Information
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For more information, please see [PHP: Comments](http://php.net/manual/en/language.basic-syntax.comments.php).
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