How can booleans be effectively used in PHP code to handle errors?

Booleans can be effectively used in PHP code to handle errors by setting a boolean variable to true when an error occurs and then checking this variable to determine if an error occurred. This can help in controlling the flow of the program and handling errors gracefully.

$error = false;

// Some code that might cause an error
if (/* condition for error */) {
    $error = true;
}

// Check if an error occurred
if ($error) {
    // Handle the error
    echo "An error occurred.";
} else {
    // Continue with the rest of the code
    echo "No errors.";
}