Why Does My MySQLi Update Function Throw a 'Call to a Member Function bind_param()' Error?

Mysqli Update Function Throws "Call to a Member Function bind_param()" Error

Problem

When attempting to update a table using the mysqli_update function, the following error is encountered: "Call to a member function bind_param() on a non-object."

Analysis

The error indicates that the $stmt object, which is used to execute the prepared statement, was not properly created. This can be caused by an issue with the query itself.

Solution

To resolve this issue:

1. Check Query Syntax

Ensure that the query syntax is correct. The query should include the table name, the SET clause, the parameters to be updated, and the WHERE clause. Check for any typos or missing elements.

2. Check for Errors

After preparing the statement, use the errno and error properties of the mysqli object to check if there were any errors during statement preparation. If errno is not 0, convert the error message using mysqli_error() and raise a PHP error using trigger_error() or throw an Exception.

3. Confirm Statement Execution

Ensure that the prepared statement is executed properly using mysqli_execute(). Check for errors during execution using mysqli_errno() and mysqli_error() after executing the statement.

Here is an example of how to check for errors during statement preparation and execution:

if (!($stmt = $mysqli->prepare($query))) {
    trigger_error($mysqli->error . "[$query]");
}

if (!$stmt->execute()) {
    trigger_error($stmt->error . "[BIND PARAMS: $stmt->errno, EXECUTE: $mysqli->errno]");
}

By following these steps, you can ensure that the query is syntactically correct, identify any errors during statement preparation, and confirm the execution of the statement. This will help prevent the "Call to a member function bind_param()" error when updating data using mysqli.

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