user/config-sample.php

<?php
/* This is a sample config file.
 * Edit this file with your own settings and save it as "config.php"
 *
 * IMPORTANT: edit and save this file as plain ASCII text, using a text editor, for instance TextEdit on Mac OS or
 * Notepad on Windows. Make sure there is no character before the opening <?php at the beginning of this file.
 */

/*
 ** MySQL settings - You can get this info from your web host
 */

/** MySQL database username */
define( 'YOURLS_DB_USER', 'your db user name' );

/** MySQL database password */
define( 'YOURLS_DB_PASS', 'your db password' );

/** The name of the database for YOURLS
 ** Use lower case letters [a-z], digits [0-9] and underscores [_] only */
define( 'YOURLS_DB_NAME', 'yourls' );

/** MySQL hostname.
 ** If using a non standard port, specify it like 'hostname:port', e.g. 'localhost:9999' or '127.0.0.1:666' */
define( 'YOURLS_DB_HOST', 'localhost' );

/** MySQL tables prefix
 ** YOURLS will create tables using this prefix (eg `yourls_url`, `yourls_options`, ...)
 ** Use lower case letters [a-z], digits [0-9] and underscores [_] only */
define( 'YOURLS_DB_PREFIX', 'yourls_' );

/*
 ** Site options
 */

/** YOURLS installation URL
 ** All lowercase, no trailing slash at the end.
 ** If you define it to "http://sho.rt", don't use "http://www.sho.rt" in your browser (and vice-versa)
 ** To use an IDN domain (eg http://héhé.com), write its ascii form here (eg http://xn--hh-bjab.com) */
define( 'YOURLS_SITE', 'http://your-own-domain-here.com' );

/** YOURLS language
 ** Change this setting to use a translation file for your language, instead of the default English.
 ** That translation file (a .mo file) must be installed in the user/language directory.
 ** See http://yourls.org/translations for more information */
define( 'YOURLS_LANG', '' );

/** Allow multiple short URLs for a same long URL
 ** Set to true to have only one pair of shortURL/longURL (default YOURLS behavior)
 ** Set to false to allow multiple short URLs pointing to the same long URL (bit.ly behavior) */
define( 'YOURLS_UNIQUE_URLS', true );

/** Private means the Admin area will be protected with login/pass as defined below.
 ** Set to false for public usage (eg on a restricted intranet or for test setups)
 ** Read http://yourls.org/privatepublic for more details if you're unsure */
define( 'YOURLS_PRIVATE', true );

/** A random secret hash used to encrypt cookies. You don't have to remember it, make it long and complicated
 ** Hint: copy from http://yourls.org/cookie */
define( 'YOURLS_COOKIEKEY', 'modify this text with something random' );

/** Username(s) and password(s) allowed to access the site. Passwords either in plain text or as encrypted hashes
 ** YOURLS will auto encrypt plain text passwords in this file
 ** Read http://yourls.org/userpassword for more information */
$yourls_user_passwords = [
	'username' => 'password',
	// 'username2' => 'password2',
	// You can have one or more 'login'=>'password' lines
];

/** URL shortening method: either 36 or 62
 ** 36: generates all lowercase keywords (ie: 13jkm)
 ** 62: generates mixed case keywords (ie: 13jKm or 13JKm) 
 ** For more information, see https://yourls.org/urlconvert */
define( 'YOURLS_URL_CONVERT', 36 );

/** Debug mode to output some internal information
 ** Default is false for live site. Enable when coding or before submitting a new issue */
define( 'YOURLS_DEBUG', false );

/**
* Reserved keywords (so that generated URLs won't match them)
* Define here negative, unwanted or potentially misleading keywords.
*/
$yourls_reserved_URL = [
	'porn', 'faggot', 'sex', 'nigger', 'fuck', 'cunt', 'dick',
];

/*
 ** Personal settings would go after here.
 */