Title: Error installing WordPress Last modified: March 11, 2022 --- # Error installing WordPress * [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/) * I am trying to install WordPress on localhost on Windows 10 for testing before upload it to my hosting service. I first tried to use XAMPP to install everything, but had to remove it. Then, I installed Apache 2.4, MySQL 8, and PHP 7.4 individually. * When I tried to run install.php I get the following message: “There has been a critical error on this website.” * After investigation, it seems like wp-db.php is using mysql_connect() instead of the newer mysqli extensions. * Apache indicates that the proper modules are installed, including php7_module. * Here’s where the install.php seems to bomb: * ``` Stack trace: #0 C:\Apache24\htdocs\wptest\wp-includes\wp-db.php(724): wpdb->db_connect() #1 C:\Apache24\htdocs\wptest\wp-includes\load.php(561): wpdb->__construct('deleted', 'deleted', 'wptest', 'localhost') #2 C:\Apache24\htdocs\wptest\wp-settings.php(124): require_wp_db() #3 C:\Apache24\htdocs\wptest\wp-config.php(101): require_once('C:\\Apache24\\htd...') #4 C:\Apache24\htdocs\wptest\wp-load.php(50): require_once('C:\\Apache24\\htd...') #5 C:\Apache24\htdocs\wptest\wp-admin\install.php(36): require_once('C:\\Apache24\\htd...') #6 {main} thrown in C:\Apache24\htdocs\wptest\wp-includes\wp-db.php on line 1785 ``` * /// * I have installed WordPress 5.9, which should have the proper extensions, or so I believe. Regardless, it seems like my installation wants to use mysql_connect() instead of mysqli . * Anyway, I am totally new to WordPress, and so it could be something quite simple. But regardless, I am stumped. * Any help would be appreciated. * Bob Frankenhoff * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-installing-wordpress-9%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 15 replies - 1 through 15 (of 20 total) 1 [2](https://wordpress.org/support/topic/error-installing-wordpress-9/page/2/?output_format=md) [→](https://wordpress.org/support/topic/error-installing-wordpress-9/page/2/?output_format=md) * [Vijay Hardaha](https://wordpress.org/support/users/vijayhardaha/) * (@vijayhardaha) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450736) * `wp-includes\load.php(561): wpdb->__construct('deleted', 'deleted', 'wptest',' localhost')` * Can you confirm that your DB username and password values are `deleted`? * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450756) * Yes, * I deleted them for security reasons. * Bob F * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450761) * I deleted them before I sent them to you. * Bob F * [Vijay Hardaha](https://wordpress.org/support/users/vijayhardaha/) * (@vijayhardaha) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450765) * Ok, I understand that you replaced the username and password with `deleted` in the error message. * Can you try `127.0.0.1` as the hostname instead of `localhost` and see if that works for you? * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450778) * Same result: * And the error log again: [11-Mar-2022 18:43:08 UTC] PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\Apache24\htdocs\wptest\ wp-includes\wp-db.php:1785 Stack trace: #0 C:\Apache24\htdocs\wptest\wp-includes\ wp-db.php(724): wpdb->db_connect() #1 C:\Apache24\htdocs\wptest\wp-includes\load. php(561): wpdb->__construct(‘deleted again’, ‘deleted again’, ‘wptest’, ‘localhost’)# 2 C:\Apache24\htdocs\wptest\wp-settings.php(124): require_wp_db() #3 C:\Apache24\ htdocs\wptest\wp-config.php(101): require_once(‘C:\\Apache24\\htd…’) #4 C:\Apache24\ htdocs\wptest\wp-load.php(50): require_once(‘C:\\Apache24\\htd…’) #5 C:\Apache24\ htdocs\wptest\wp-admin\install.php(36): require_once(‘C:\\Apache24\\htd…’) #6{ main} thrown in C:\Apache24\htdocs\wptest\wp-includes\wp-db.php on line 1785 * [Vijay Hardaha](https://wordpress.org/support/users/vijayhardaha/) * (@vijayhardaha) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450787) * Updated: Please check your php.ini and make sure `mysqli` extensions are loading. - This reply was modified 4 years, 2 months ago by [Vijay Hardaha](https://wordpress.org/support/users/vijayhardaha/). * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450826) * Sorry, * I only used 127.0.0.1 on my browser. Here it is again with changes in wp-config. php: * ``` Stack trace: #0 C:\Apache24\htdocs\wptest\wp-includes\wp-db.php(724): wpdb->db_connect() #1 C:\Apache24\htdocs\wptest\wp-includes\load.php(561): wpdb->__construct('del', 'del', 'wptest', '127.0.0.1') #2 C:\Apache24\htdocs\wptest\wp-settings.php(124): require_wp_db() #3 C:\Apache24\htdocs\wptest\wp-config.php(101): require_once('C:\\Apache24\\htd...') #4 C:\Apache24\htdocs\wptest\wp-load.php(50): require_once('C:\\Apache24\\htd...') #5 C:\Apache24\htdocs\wptest\wp-admin\install.php(36): require_once('C:\\Apache24\\htd...') #6 {main} thrown in C:\Apache24\htdocs\wptest\wp-includes\wp-db.php on line 1785 ``` * Php.ini is a big file. What exactly am I looking for? * Bob F * [Vijay Hardaha](https://wordpress.org/support/users/vijayhardaha/) * (@vijayhardaha) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450830) * Look for lines * ``` extension_dir="ext" extension=mysql extension=mysqli ``` * [Vijay Hardaha](https://wordpress.org/support/users/vijayhardaha/) * (@vijayhardaha) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450865) * To know, you can also use [https://localwp.com/](https://localwp.com/) if you’re not comfortable setting & fixing all these environment things manually. * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450924) * Well, I uncommented * extension_dir = “ext” extension=mysql extension=mysqli * Still doesn’t work. * Do I need to re-start httpd.exe? (I did.) * You also mentioned absolute paths to these modules. I’m sure I have added additional folders (e.g. wptest/). * However, you also mentioned [https://localwp.com/](https://localwp.com/) . * I have worked with the environment in Windows 10, but it is new to me and for some things I prefer Linux. * Bob F * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15450935) * Also, any concerns regarding caching? * Bob F * [Dion](https://wordpress.org/support/users/diondesigns/) * (@diondesigns) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15451237) * It sounds like you’re not loading the PHP `mysqlnd` extension. Without `mysqlnd`, the `mysqli` extension will not recognize the new authentication plugins used by MySQL8. * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15451287) * Regarding mysqlnd, I do not seem to see a file with that name anywhere, e.g. php_mysqlmd.dll or similar. Is that a part of the PHP extensions–should it be in the ext directory of PHP? If not, where might I find it? * Thanks, * Bob F * Thread Starter [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * (@rfrankenhoff) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15451308) * Also, I did install MySQL myself. I tried setting up a server with XAMPP, but nothing worked correctly other than MySQL. Perhaps I did not install MySQL with the correct options??? I did remove it and re-install it. * Bob F * [Dion](https://wordpress.org/support/users/diondesigns/) * (@diondesigns) * [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/#post-15451473) * Sorry about that…I completely missed the Windows 10 statement in your first post. Windows builds of PHP from windows.php.net have `mysqlnd` compiled into the ` php_mysqli.dll` file. * Windows builds of PHP do not support named pipes, so make sure you configure MySQL to use TCP (`skip-networking` and `enable-named-pipe` must be disabled!), and then use 127.0.0.1 for the hostname. You might also want to read this: * [https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password](https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password) Viewing 15 replies - 1 through 15 (of 20 total) 1 [2](https://wordpress.org/support/topic/error-installing-wordpress-9/page/2/?output_format=md) [→](https://wordpress.org/support/topic/error-installing-wordpress-9/page/2/?output_format=md) The topic ‘Error installing WordPress’ is closed to new replies. ## Tags * [install.php](https://wordpress.org/support/topic-tag/install-php/) * [php74](https://wordpress.org/support/topic-tag/php74/) * In: [Installing WordPress](https://wordpress.org/support/forum/installation/) * 20 replies * 4 participants * Last reply from: [rfrankenhoff](https://wordpress.org/support/users/rfrankenhoff/) * Last activity: [4 years, 2 months ago](https://wordpress.org/support/topic/error-installing-wordpress-9/page/2/#post-15453110) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics