How can a PHP developer effectively debug and troubleshoot issues related to variable definitions and function calls in conditional statements?

When debugging variable definitions and function calls in conditional statements in PHP, it is important to check if the variables are properly defined and if the functions are being called correctly. To troubleshoot these issues, you can use var_dump() or print_r() to display the values of the variables and ensure they are what you expect. Additionally, you can use error_reporting(E_ALL) to display any errors related to variable definitions and function calls.

// Example code snippet to debug variable definitions and function calls in conditional statements
error_reporting(E_ALL);

$var1 = 'Hello';
$var2 = 'World';

if(isset($var1) && isset($var2)){
    echo $var1 . ' ' . $var2;
} else {
    echo 'Variables not properly defined';
}