Why Do I Receive \"Number of Variables Does Not Match Number of Parameters\" Error in MySQL with Prepared Statements?

Question: Why Am I Getting "bind_param: Number of Variables Does Not Match Number of Parameters" in MySQL?

In a PHP script using MySQL, you are facing an issue while executing a prepared statement and receiving the warning "Number of variables doesn't match number of parameters in prepared statement." This can occur when the number of question marks in the prepared statement does not align with the number of variables bound in the bind_param() method.

Solution:

To resolve this issue, ensure that the number of question marks in the prepared statement matches the number of variables passed to bind_param(). Here's an example of a corrected code snippet:

<code class="php">$stmt = $mysqli->prepare("SELECT DISTINCT model FROM vehicle_types WHERE year = ? AND make = ? ORDER by model");
$stmt->bind_param('is', $year, $make);
$stmt->execute();</code>

In this example, the prepared statement contains two question marks, and the bind_param() method binds two variables, $year and $make. The first letter in 'is' specifies the type of the first parameter (integer), and the second letter specifies the type of the second parameter (string).

Remember, when preparing a statement, you must replace every variable with a question mark without quotes. A question mark within quotes will not be interpreted as a placeholder.

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