How can one effectively debug PHP code to identify and resolve issues such as unsupported operand types?

To effectively debug PHP code and resolve issues such as unsupported operand types, you can use var_dump() or print_r() functions to check the data types of variables involved in the operation. Make sure that the variables are of the correct type before performing any arithmetic operations. You can also use strict type declarations to ensure that PHP will throw a fatal error if incompatible types are used in operations.

// Example code snippet demonstrating the use of var_dump() to check variable types
$var1 = 10;
$var2 = "20";

var_dump($var1); // int(10)
var_dump($var2); // string(2) "20"

// Perform arithmetic operation only if both variables are of type int
if (is_int($var1) && is_int($var2)) {
    $result = $var1 + $var2;
    echo $result; // Output: 30
} else {
    echo "Unsupported operand types";
}