In your PHP code, have you ensured that the database connection is properly established before executing the update function?

Before executing the update function in PHP, it is crucial to ensure that the database connection is properly established. This can be achieved by checking if the connection object is valid or not before proceeding with the update operation. If the connection is not established, the update function should not be executed to prevent errors. 

// Check if the database connection is established before updating
if ($conn) {
    // Proceed with the update operation
    $sql = "UPDATE table_name SET column_name = 'new_value' WHERE condition";
    if (mysqli_query($conn, $sql)) {
        echo "Record updated successfully";
    } else {
        echo "Error updating record: " . mysqli_error($conn);
    }
} else {
    echo "Database connection error. Update operation cannot be performed.";
}

Keywords

PHP database connection update function error handling SQL injection

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