How can echo be a problematic method for debugging in PHP, and what are the alternatives?

Using echo for debugging in PHP can be problematic because it can interfere with the structure of the output, especially in larger applications. It can also be difficult to track multiple echo statements and can clutter the code. An alternative method is to use var_dump() or print_r() functions, which provide more structured and detailed information about variables and arrays.

// Using var_dump() for debugging
$variable = "Hello, World!";
var_dump($variable);