What are some recommended best practices for handling and displaying variables in PHP to avoid confusion or errors in output?

When handling and displaying variables in PHP, it's important to ensure that the correct variable is being output and avoid any confusion or errors. One recommended best practice is to use concatenation or interpolation to clearly display variables within strings. Additionally, using proper naming conventions for variables can help avoid confusion and make the code more readable.

// Example of using concatenation to display variables
$name = "John";
$age = 30;
echo "Hello, " . $name . ". You are " . $age . " years old.";

// Example of using interpolation to display variables
$name = "Jane";
$age = 25;
echo "Hello, $name. You are $age years old.";