Why is it important for developers to have a clear understanding of variable data types in PHP, even when using Typehint in the use() function?

Developers need to have a clear understanding of variable data types in PHP even when using Typehint in the use() function because Typehint only enforces the data type of the parameter passed to the function, not the data type of the variable within the function itself. This means that developers still need to ensure that the variable data types match the expected types within the function to avoid unexpected behavior or errors.

function exampleFunction(string $param) {
    $var = 123; // This will cause a type error
    // Do something with $var
}