Why Does My PHP Code Throw a 'Cannot pass parameter 2 by reference' Error in `mysqli::bind_param()`?

"Cannot pass parameter 2 by reference" PHP Error

When encountering this error, it indicates that the function or method in question expects the second parameter to be passed by reference, yet a value is being passed instead.

In this specific case, the error arises from the bind_param method within the mysqli class. This method expects the second parameter to be a reference to a variable, but the code attempts to pass it an integer value of 0.

To rectify this error, a new variable should be created (such as $a) and assigned the value of 0. Then, the bind_param method can be called with $a as the second parameter:

$a = 0;
$update->bind_param("is", $a, $selectedDate);  // Line 13 corrected

This approach ensures that the bind_param method receives a reference to a variable, as required.

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