How can PHP developers ensure proper data type handling when passing variables to functions?

PHP developers can ensure proper data type handling when passing variables to functions by using type declarations. Type declarations specify the data type of a parameter, ensuring that only values of that type can be passed into the function. This helps prevent unexpected data types from being used, reducing the risk of errors and improving code reliability. 

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

// Usage
$result = calculateSum(5, 10); // Returns 15

Keywords

PHP data type handling variables functions error handling

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