What is the usage of require_once in PHP?

In PHP, require_once is a function used to include and execute a specified file. Similar to require, the difference is that require_once ensures the included file is only imported once, even if it is called multiple times in the code. This helps prevent issues with redefining functions or classes.

The syntax for using require_once is as follows:

require_once 'path_to_file.php';

It’s important to note that if the specified file does not exist or contains errors, using require_once will result in a fatal error and terminate the script execution. Therefore, when using require_once, make sure the file being included exists and is error-free.

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