What are the potential pitfalls of not passing variables correctly in PHP functions?

If variables are not passed correctly in PHP functions, it can lead to unexpected behavior or errors in the code. To ensure variables are passed correctly, make sure to declare parameters in the function definition and pass the correct number of arguments when calling the function. 

// Incorrect way of passing variables in a function
function addNumbers($num1, $num2) {
    return $num1 + $num2;
}

$result = addNumbers(5); // This will result in an error as only one argument is passed instead of two

// Correct way of passing variables in a function
function addNumbers($num1, $num2) {
    return $num1 + $num2;
}

$result = addNumbers(5, 10); // This will correctly pass two arguments to the function

Keywords

variable scope function parameters global keyword PHP errors undefined variable

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