PHP: Secrets Loader - Place Secrets.php in the root of the project. Loads files within ./secrets/*.php adapting $secrets[] to $_ENV['secrets'][].

Secrets.php

<?php

/**
 * Loads secrets into the application. Setup secrets via $secrets[], get secrets via $_ENV['secrets'][]
 */
class Secrets{

	public static function load(){
		
		$secrets_path = __DIR__ . '/secrets';
		$secrets_loaded = false;

		//see if "secrets folder" exists
		if(file_exists($secrets_path) AND is_dir($secrets_path)){

			foreach(new DirectoryIterator($secrets_path) as $file){

				//ignore dots and non-php extensions and this file itself
				if($file->isDot() OR $file->getExtension() != 'php') continue;
				
				$secrets_loaded = true;

				include_once($file->getPathname());

			}

		}

		if($secrets_loaded){

			foreach($secrets as $key => $value){

				$_ENV['secrets'][$key] = $value;

			}

			unset($secrets);

		}

	}

}

I ended up using PHP's parse_ini_file() to store secrets.
But this Secrets code is useful.