Allow to use a database DSN instead of all the database variables

.env.example

@@ -2,6 +2,10 @@ DB_NAME=database_name
 DB_USER=database_user
 DB_PASSWORD=database_password
 
+# Or you can use a DSN (database source name) 
+# In this case you can leave empty variables DB_NAME, DB_USER, DB_PASSWORD, DB_HOST 
+# DATABASE_URL=mysql://database_user:database_password@database_host:database_port/database_name
+
 # Optional variables
 # DB_HOST=localhost
 # DB_PREFIX=wp_

README.md

@@ -27,10 +27,12 @@ Much of the philosophy behind Bedrock is inspired by the [Twelve-Factor App](htt
     $ composer create-project roots/bedrock
     ```
 2. Update environment variables in the `.env` file:
-  * `DB_NAME` - Database name
-  * `DB_USER` - Database user
-  * `DB_PASSWORD` - Database password
-  * `DB_HOST` - Database host
+  * Database variables
+    * `DB_NAME` - Database name
+    * `DB_USER` - Database user
+    * `DB_PASSWORD` - Database password
+    * `DB_HOST` - Database host
+    * You can also use a variable `DATABASE_URL` instead of using all the database variables above, that contains a DSN (ex: `mysql://user:password@127.0.0.1:3306/db_name`)
   * `WP_ENV` - Set to environment (`development`, `staging`, `production`)
   * `WP_HOME` - Full URL to WordPress home (https://example.com)
   * `WP_SITEURL` - Full URL to WordPress including subdirectory (https://example.com/wp)

config/application.php

@@ -52,10 +52,18 @@
 /**
  * DB settings
  */
-Config::define('DB_NAME', env('DB_NAME'));
-Config::define('DB_USER', env('DB_USER'));
-Config::define('DB_PASSWORD', env('DB_PASSWORD'));
-Config::define('DB_HOST', env('DB_HOST') ?: 'localhost');
+$hasDsn = env('DATABASE_URL') !== null ? true : false;
+
+if (true === $hasDsn) {
+    $databaseDsn = parse_url(env('DATABASE_URL'));
+    $dbName = substr($databaseDsn['path'], 1);
+    $dbHost = isset($databaseDsn['port']) ? $databaseDsn['host'] . ":" . $databaseDsn['port'] : $databaseDsn['host'];
+}
+
+Config::define('DB_NAME', $hasDsn ? $dbName : env('DB_NAME'));
+Config::define('DB_USER', $hasDsn ? $databaseDsn['user'] : env('DB_USER'));
+Config::define('DB_PASSWORD', $hasDsn ? ($databaseDsn['pass'] ?? null) : env('DB_PASSWORD'));
+Config::define('DB_HOST', $hasDsn ? $dbHost : env('DB_HOST') ?: 'localhost');
 Config::define('DB_CHARSET', 'utf8mb4');
 Config::define('DB_COLLATE', '');
 $table_prefix = env('DB_PREFIX') ?: 'wp_';