Uncaught Error: Call to a member function bind_param()

You get this error when you try to connect to a database using the MySQLi extension but do not have a valid MySQLi statement object to call the bind_param() method.

The bind_param() method is used to create a MySQLi statement object, so that you can bind parameters in an SQL query. But, if you do not have a valid MySQLi statement object, this method cannot be called.

There can be several possible reasons for this error:

1. MySQLi statement object was not created

You did not call the prepare() method to create a MySQLi statement object.

 2. MySQLi statement object is incorrect

You have called prepare() method to create a MySQLi statement object, but this object is incorrect or null.

3. SQL query is incorrect

Your SQL query is incorrect or there is a syntax error, due to which there is a problem in creating the MySQLi statement object.

To resolve this error, you have to follow these steps:

1. Create a MySQLi statement object

Call prepare() method to create your MySQLi statement object.

2. Check the MySQLi statement object

Check your MySQLi statement object to see if it is valid or not.

 3. Check the SQL query

Check your SQL query to see if it is wrong or has a syntax error.

For example:

$stmt = $mysqli->prepare("SELECT * FROM table WHERE id = ?");
if (!$stmt) {
echo "MySQLi statement object not created";
exit;
}
$stmt->bind_param("i", $id);
$stmt->execute();

This code calls the prepare() method to create a MySQLi statement object and then calls the bind_param() method.  If the MySQLi statement object is not created, then this code prints an error message.