What are some best practices for handling variable initialization and error reporting in PHP, particularly when using isset()?

When handling variable initialization and error reporting in PHP, it is important to check if a variable is set using isset() before using it to avoid undefined variable errors. Additionally, it is good practice to initialize variables to a default value to prevent unexpected behavior. Error reporting can be improved by using error_reporting(E_ALL) to display all errors and warnings.

// Initialize variables with default values
$variable1 = '';
$variable2 = 0;

// Check if variables are set before using them
if(isset($_POST['variable1'])){
    $variable1 = $_POST['variable1'];
}

if(isset($_POST['variable2'])){
    $variable2 = $_POST['variable2'];
}

// Set error reporting to display all errors and warnings
error_reporting(E_ALL);