wp-config.php中MySQL主机名语法解析错误排查求助

Hey there, let's troubleshoot that syntax error you're hitting. The error points to line 41 (your DB_HOST config), but looking at the code you shared, that line looks correct at first glance. Here are the most common fixes to try:

• Check for hidden special characters
  Sometimes copy-pasting files or encoding issues can sneak in invisible characters (like full-width semicolons, non-breaking spaces, or UTF-8 BOM markers) that PHP can't parse correctly. Even if the line looks fine, these hidden characters will throw errors.
  Grab a plain-text editor (Notepad++, VS Code, etc.), turn on "show all characters" mode, and inspect line 41 and the lines around it. If you spot any weird symbols, delete them and retype the line manually:

  define('DB_HOST', 'localhost');
  

  Make sure you're using half-width (English) quotes and semicolons—full-width characters from other languages will break PHP.

• Verify file encoding
  If your wp-config.php is saved in an encoding other than UTF-8 (without BOM), PHP might misinterpret the code. In your editor, check the encoding setting:

  • In VS Code: Click the encoding label in the bottom-right corner and select "UTF-8".
  • In Notepad++: Go to the "Encoding" menu and choose "UTF-8 without BOM".
    Save the file after changing the encoding and test again.

• Double-check nearby lines
  Sometimes the line number in the error can be off (due to hidden lines or comments). Take a close look at the lines right before line 41—specifically the DB_PASSWORD definition:

  define('DB_PASSWORD', '');
  

  Ensure the quotes and semicolon here are also valid half-width characters, no typos or missing symbols.

• Recreate the config section
  If the file got corrupted during backup/transfer, try rewriting the entire MySQL settings block from scratch. Replace the existing config lines with this clean code:

  // ** MySQL settings - You can get this info from your web host ** //
  /** The name of the database for WordPress */
  define('DB_NAME', 'new_test_db');
  /** MySQL database username */
  define('DB_USER', 'root');
  /** MySQL database password */
  define('DB_PASSWORD', '');
  /** MySQL hostname */
  define('DB_HOST', 'localhost');
  /** Database Charset to use in creating database tables. */
  define('DB_CHARSET', 'utf8');
  /** The Database Collate type. Don't change this if in doubt. */
  define('DB_COLLATE', '');
  

• Enable debug mode for more clues
  If none of the above works, turn on WordPress debug mode to get more detailed error info. Find this line in wp-config.php:

  define('WP_DEBUG', false);
  

  Change it to:

  define('WP_DEBUG', true);
  

  This will show additional errors that might point you to the real issue.

内容的提问来源于stack exchange，提问作者hims