How can constants be defined in PHP to be visible only within the respective file?

To define constants in PHP that are visible only within the respective file, you can use the `define()` function within the file itself. By defining the constants within the file scope, they will not be accessible outside of that specific file. This helps in encapsulating the constants and preventing unintended changes or conflicts with constants defined in other files. 

<?php
// Define constants within the file scope
define('MY_CONSTANT', 'This is a constant value');

// Usage of the constant within the file
echo MY_CONSTANT;
?>

Keywords

PHP constants visibility file scope define

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