What potential issues can arise when passing variables to functions in PHP, especially when dealing with integer vs string types?

When passing variables to functions in PHP, potential issues can arise when dealing with integer vs string types. To avoid type mismatch errors, it is important to properly typecast the variables before passing them to the function. This can be done using functions like `intval()` or `(int)` for integers and `strval()` or `(string)` for strings. 

// Example of passing variables to a function with proper typecasting
$number = "10";
$stringNumber = "20";

function addNumbers(int $num1, int $num2) {
    return $num1 + $num2;
}

$result = addNumbers(intval($number), intval($stringNumber));
echo $result; // Output: 30

Keywords

type coercion type juggling strict typing type declaration implicit conversion

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