How to Resolve Binding Parameter Number Mismatch in Prepared Statements?

"bind_param Number of Variables Doesn't Match Number of Parameters in Prepared Statement"

In your provided code snippet, the warning you encountered stems from a mismatch between the number of variables in your bind_param() method and the number of parameters in your prepared statement. To resolve this issue, it's crucial to ensure that these two numbers align.

The prepared statement you initially used:

$stmt = $mysqli->prepare("SELECT DISTINCT model FROM vehicle_types 
    WHERE year = ? AND make = '?' ORDER by model");

contains an error. The placeholder for the make parameter is incorrectly enclosed in quotes ('?'). In prepared statements, placeholders should be denoted by question marks without quotes.

The corrected prepared statement:

$stmt = $mysqli->prepare("
    SELECT DISTINCT model FROM vehicle_types WHERE year = ? AND make = ? ORDER by model
");

now has two placeholders, matching the two variables in your bind_param() method:

$stmt->bind_param('is', $year, $make);

By eliminating the incorrect quotes around the make placeholder, you align the number of variables and parameters, resolving the mismatch error.

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