title: Uncaught Error: Call to undefined function mysql_connect() - WordPress Setup
body: <p>Am trying to install wordpress on nginx on windows 10, wont able to complete setup i see this after entering database connection info:</p>
  <blockquote>
  <p>There has been a critical error on your website.</p>
  </blockquote>
  <p>errors from php log file</p>
  <blockquote>
  <p>Stack trace:
  #0 C:\nginx\html\wp\wp-admin\setup-config.php(310): wpdb-&gt;db_connect()
  #1 {main}   thrown in C:\nginx\html\wp\wp-includes\wp-db.php on line 1670
  [30-Aug-2020 12:55:09 UTC] PHP Fatal error:  Uncaught Error: Call to
  undefined function mysqli_connect() in
  C:\nginx\html\wp\wp-includes\wp-db.php:1670</p>
  </blockquote>
  <p>replacing mysql_connect() with mysqli_connect() in wp-db.php did not solve the problem for me</p>
  <p>server info:</p>
  <ul>
  <li>Windows 10 Home x64-bit</li>
  <li>nginx 1.17.10</li>
  <li>php 7.4.9.0 &gt;&gt; VC15 x64 Non Thread Safe (2020-Aug-04 15:17:37)</li>
  <li>mysql 5.7.23.0</li>
  </ul>
  <p>nginx config:</p>
  <pre><code>#user  nobody;
  worker_processes  1;
  
  #error_log  logs/error.log;
  #error_log  logs/error.log  notice;
  #error_log  logs/error.log  info;
  
  #pid        logs/nginx.pid;
  
  
  events {
      worker_connections  1024;
  }
  
  
  http {
      include       mime.types;
      default_type  application/octet-stream;
  
      #log_format  main  '$remote_addr - $remote_user [$time_local] &quot;$request&quot; '
      #                  '$status $body_bytes_sent &quot;$http_referer&quot; '
      #                  '&quot;$http_user_agent&quot; &quot;$http_x_forwarded_for&quot;';
  
      #access_log  logs/access.log  main;
  
      sendfile        on;
      #tcp_nopush     on;
  
      #keepalive_timeout  0;
      keepalive_timeout  65;
  
      #gzip  on;
  
      server {
          listen       80;
          server_name  localhost;
  
          #charset koi8-r;
  
          #access_log  logs/host.access.log  main;
  
          location / {
              root   html;
              index  index.php index.html index.htm;
          }
          
          #error_page  404              /404.html;
  
          # redirect server error pages to the static page /50x.html
          #
          error_page   500 502 503 504  /50x.html;
          location = /50x.html {
              root   html;
          }
  
          # proxy the PHP scripts to Apache listening on 127.0.0.1:80
          #
          #location ~ \.php$ {
          #    proxy_pass   http://127.0.0.1;
          #}
  
          # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
          #
          location ~ \.php$ {
             root           html;
             fastcgi_pass   127.0.0.1:9000;
             fastcgi_index  index.php;
             fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
             include        fastcgi_params;
          }
  
          # deny access to .htaccess files, if Apache's document root
          # concurs with nginx's one
          #
          #location ~ /\.ht {
          #    deny  all;
          #}
      }
  
  
      # another virtual host using mix of IP-, name-, and port-based configuration
      #
      #server {
      #    listen       8000;
      #    listen       somename:8080;
      #    server_name  somename  alias  another.alias;
  
      #    location / {
      #        root   html;
      #        index  index.html index.htm;
      #    }
      #}
  
  
      # HTTPS server
      #
      #server {
      #    listen       443 ssl;
      #    server_name  localhost;
  
      #    ssl_certificate      cert.pem;
      #    ssl_certificate_key  cert.key;
  
      #    ssl_session_cache    shared:SSL:1m;
      #    ssl_session_timeout  5m;
  
      #    ssl_ciphers  HIGH:!aNULL:!MD5;
      #    ssl_prefer_server_ciphers  on;
  
      #    location / {
      #        root   html;
      #        index  index.html index.htm;
      #    }
      #}
  
  }
  </code></pre>
  <p>php-cgi is always running on 127.0.0.1:9000 before starting nginx</p>