What is the significance of the warning "mysqli_query() expects parameter 1 to be mysqli" in PHP and how can it be resolved?

The warning "mysqli_query() expects parameter 1 to be mysqli" in PHP indicates that the function mysqli_query() is not receiving a valid MySQL connection as its first parameter. This can be resolved by ensuring that a valid MySQLi connection is established before calling mysqli_query(). This can be done by using the mysqli_connect() function to establish a connection. 

// Establish a MySQLi connection
$connection = mysqli_connect('localhost', 'username', 'password', 'database');

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

// Perform a query using the valid MySQLi connection
$query = "SELECT * FROM table_name";
$result = mysqli_query($connection, $query);

// Process the query result
if ($result) {
    // Process the result
} else {
    echo "Error: " . mysqli_error($connection);
}

// Close the connection
mysqli_close($connection);

Keywords

mysqli_query parameter mysqli error resolution

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