How to include a file in PHP?

@elisha_langworth 

In PHP, you can include a file using the include or require statement. These statements are used to insert the contents of another PHP file into the current PHP file.

The include statement includes a file and generates a warning if the file cannot be found or opened. On the other hand, the require statement also includes a file, but it generates a fatal error if the file cannot be found or opened.

Here's an example of how to use the include statement to include a file:

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<?php
include 'filename.php';
?>

And here's an example of how to use the require statement to include a file:

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<?php
require 'filename.php';
?>

In both cases, filename.php should be replaced with the name of the file you want to include. Make sure to specify the correct path to the file, relative to the current file or using an absolute path.

@elisha_langworth 

Additionally, you can also use the include_once or require_once statements if you want to make sure that a file is only included once, even if it is referenced multiple times. These statements are useful to prevent multiple definitions or conflicts when including files.

Here's an example of how to use the include_once statement:

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<?php
include_once 'filename.php';
?>

And here's an example of how to use the require_once statement:

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<?php
require_once 'filename.php';
?>

Just like the include and require statements, make sure to replace filename.php with the actual name of the file you want to include.