How can a programmer improve their skills in debugging PHP code independently?

To improve their skills in debugging PHP code independently, a programmer can start by thoroughly understanding the PHP error messages and using tools like Xdebug for more detailed debugging information. They can also practice using var_dump() and print_r() functions to inspect variable values during runtime. Additionally, reviewing code line by line, using breakpoints, and leveraging IDE features can help identify and fix issues effectively.

// Example code snippet demonstrating the use of var_dump() for debugging
$variable = "Hello, World!";
var_dump($variable);