What steps can be taken to debug PHP code to identify issues with variable passing?

To debug PHP code to identify issues with variable passing, you can use functions like var_dump() or print_r() to display the contents of variables at different points in your code. This can help you track the values of variables as they are passed from one part of the code to another. Additionally, you can use error reporting functions like error_reporting(E_ALL) to catch any errors related to variable passing.

// Example PHP code snippet to debug variable passing
$var1 = "Hello";
$var2 = "World";

// Display the values of variables using var_dump()
var_dump($var1);
var_dump($var2);

// Pass variables to a function
function displayMessage($message1, $message2) {
    echo $message1 . " " . $message2;
}

displayMessage($var1, $var2);