How can the error "Undefined variable: mysqli" be resolved in PHP code?

The error "Undefined variable: mysqli" occurs when the mysqli object is not properly initialized or declared before use in PHP code. To resolve this issue, you need to create a connection to the MySQL database using the mysqli_connect() function and assign it to a variable named $mysqli. This variable can then be used to perform database operations. 

// Create a connection to the MySQL database
$mysqli = mysqli_connect("localhost", "username", "password", "database_name");

// Check connection
if (!$mysqli) {
    die("Connection failed: " . mysqli_connect_error());
}

Keywords

mysqli undefined variable PHP error resolution

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