What does the "../" notation signify in a file path in PHP, and how can it be used effectively?

The "../" notation in a file path in PHP signifies moving up one directory level in the file system. This can be used effectively to navigate to a parent directory when including or requiring files in PHP scripts. Example PHP code snippet: 

<?php
// Include a file from a parent directory
include "../file.php";
?>

Keywords

file path PHP "../" notation directory traversal include statement

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