Fatal error Call to undefined function mysqli connect

Question

For 2 days now I m trying to solve this  but unfortunately no result  Let me tell you my story about the problem  I ve bulid an application on a site  and the application deals with the reviews  But  I m trying to put it on another site  and I copyed the php files  the sql file from the old site  and moved them to the new site  they are on different FTP servers   When I m trying to go to the pages from the application  I receive this FATAL ERROR      Fatal error  Call to undefined function mysqli connect     The code that I wrote to connect to the database is this  with hidden credentials     con   mysqli connect      the name     the pass     the database     if  mysqli connect errno          echo  Failed to connect to MySQL      mysqli connect error        Why do I get the error  It works on the old server  and the code I think it s not the problem  because it works on localhost  and on the new server it doesn t  Can anyone help me

User · Answer

On Raspberry Pi I had to install php5 mysql extension.

apt-get install php5-mysql

After installing the client, the webserver should be restarted. In case you're using apache, the following should work:

sudo service apache2 restart

User · Answer

Mine was a bit different for php7 on centos7      In  etc php ini       extension mysqli  to  extension mysqli

User · Answer

So this may not be the issue for you  but I was struggling with this error  I discovered what was causing my problem  though I can t really explain as to why   For me  mysqli connect was working fine where the connection was made on pages in any various sub-directory  For some reason though  the same code referenced on pages in the root directory was returning this error  The strange thing is that it was working fine on my localhost environment in MAMP in the root directory  however on my shared host it was not   After struggling to figure out what was giving me  Error 500  white screen from this  PHP Fatal Error   I went through the code and stumbled upon this code in the error handling that was suggested by the PHP Manual  https   www php net manual en mysqli error php    if   mysqli query  link   SET a 1          printf  Error message   s n   mysqli error  link        I randomly decided to remove it and  voila  connection to the database working in root directories  Maybe someone smarter than me can explain this  for anyone struggling with a similar issue

User · Answer

Happens when php extensions are not being used by default  In your php ini file  change  extension php mysql dll to extension php mysql dll    If this error logs  then add path to this dll file  eg extension C  Php php-   -nts-Win32-VC11-x86 ext php mysql dllDo same for php mysqli dll and php pdo mysql dll  Save and run your code again

User · Answer

Late to the conversation     If you have the module installed and set your PHP INI file properly  check your apache error log for something like the following   PHP Warning   PHP Startup  Unable to load dynamic library  C  php ext php mysqli dll  - The specified module could not be found   In this case  your extension directory is not what you think it is   You may neeed to set it explicitly  like so    extension dir  C  xampp php ext

User · Answer

For CentOS  do   sudo yum install php-mysqli

User · Answer

Mysqli isn t installed on the new server  Run phpinfo   to confirm    lt  php   phpinfo

User · Answer

if you use ubuntu 16 04  maybe and above  you have this module already but not enabled by default  Just do this   sudo phpenmod mysqli

User · Answer

If you host the server yourself  in the php ini file remove the semicolon in front of the extension extension php mysqli dll

User · Answer

If you host the server yourself  and that server happens to be Apache  you can also get this error even if you have uncommented extension php mysqli dll in php ini   You also need to tell Apache where to find php ini by using the PHPIniDir directive in Apache s httpd conf  AddHandler application x-httpd-php  php PHPIniDir   lt path-to-folder-where-php-ini-lives gt

User · Answer

Simply do it  sudo apt install php-mysqli  It works perfectly and it is version independent

User · Answer

On Ubuntu I had to install php5 mysql extension  apt-get install php5-mysql

User · Answer

I followed below link to fix this problem  Make sure to enable following Module    php -r  phpinfo       grep -i mysqli  Link   https   askubuntu com questions 773601 php-mysqli-extension-in-ubuntu-16-04-not-working-after-upgrade-to-version-7-0-6

User · Answer

There is no error in the  but the mysqli PHP extension is not installed on your machine  Please contact your service provider to fix this issue

[php] Fatal error: Call to undefined function mysqli_connect()

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