Improve SQLite detection robustness; update synopsis descriptions; add Behat scenario for missing dbname/dbuser

Agent-Logs-Url: https://github.com/wp-cli/config-command/sessions/53294434-a981-4597-8efc-1a642de88b29

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

features/config-create.feature

@@ -163,6 +163,27 @@ Feature: Create a wp-config file
       Error: Database connection error
       """
 
+  @require-mysql
+  Scenario: Missing --dbname or --dbuser without SQLite integration
+    Given an empty directory
+    And WP files
+
+    When I try `wp config create --skip-check --dbuser=someuser`
+    Then the return code should be 1
+    And STDERR should contain:
+      """
+      Error: Parameter errors:
+      missing --dbname parameter (Set the database name.)
+      """
+
+    When I try `wp config create --skip-check --dbname=somedb`
+    Then the return code should be 1
+    And STDERR should contain:
+      """
+      Error: Parameter errors:
+      missing --dbuser parameter (Set the database user.)
+      """
+
   @require-mysql
   Scenario: Configure with database credentials using socket path
     Given an empty directory

src/Config_Command.php

@@ -121,10 +121,10 @@ private static function get_initial_locale() {
 	 * ## OPTIONS
 	 *
 	 * [--dbname=<dbname>]
-	 * : Set the database name.
+	 * : Set the database name. Required unless the SQLite integration drop-in is detected.
 	 *
 	 * [--dbuser=<dbuser>]
-	 * : Set the database user.
+	 * : Set the database user. Required unless the SQLite integration drop-in is detected.
 	 *
 	 * [--dbpass=<dbpass>]
 	 * : Set the database user password.
@@ -1505,14 +1505,19 @@ private static function is_sqlite_integration_active() {
 		$wp_content_dir = defined( 'WP_CONTENT_DIR' ) ? WP_CONTENT_DIR : ABSPATH . 'wp-content';
 		$db_dropin_path = $wp_content_dir . '/db.php';
 
-		if ( file_exists( $db_dropin_path ) ) {
-			$db_dropin_contents = file_get_contents( $db_dropin_path, false, null, 0, 8192 );
-			if ( false !== $db_dropin_contents && false !== strpos( $db_dropin_contents, 'SQLITE_DB_DROPIN_VERSION' ) ) {
-				return true;
-			}
+		if ( ! is_file( $db_dropin_path ) || ! is_readable( $db_dropin_path ) ) {
+			return false;
+		}
+
+		$db_dropin_contents = file_get_contents( $db_dropin_path, false, null, 0, 8192 );
+		if ( false === $db_dropin_contents ) {
+			return false;
 		}
 
-		return false;
+		return 1 === preg_match(
+			'/\b(?:define\s*\(\s*[\'"]SQLITE_DB_DROPIN_VERSION[\'"]|const\s+SQLITE_DB_DROPIN_VERSION\b)/',
+			$db_dropin_contents
+		);
 	}
 
 	/**