


Why is My PHP Code Throwing a 'Call to Undefined Function mysqli_connect()' Error on the New Server?
Fatal Error: Resolving "Call to Undefined Function mysqli_connect() at New Hosting Destination
Problem Statement:
While migrating an application dealing with reviews to a new hosting site, the developer encountered the error "Fatal error: Call to undefined function mysqli_connect()." This issue did not occur on the original hosting server, despite using identical code that also functioned on a local host.
Code Snippet:
$con = mysqli_connect("","*the_name*","*the_pass*","*the_database*"); if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); }
Cause of the Error:
The error typically indicates that the MySQL extension for PHP is not available on the new hosting site. Without this extension, the mysqli_connect() function cannot be executed.
Solution:
To resolve the error, the PHP-MySQL extension needs to be installed on the new hosting server. Execute the following command in the terminal:
sudo apt install php-mysqli
Rationale:
sudo apt install php-mysqli updates the system database to include the necessary dependencies for running MySQL extension. It retrieves and compiles the extension, making mysqli_connect() and other MySQL functions available for use.
Additional Note:
The solution provided in the question using sudo apt install php7.2-mysqli may not be applicable in all cases, as it specifies a specific PHP version. Using php-mysqli ensures compatibility across different versions of PHP.
The above is the detailed content of Why is My PHP Code Throwing a 'Call to Undefined Function mysqli_connect()' Error on the New Server?. For more information, please follow other related articles on the PHP Chinese website!

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