What are best practices for concatenating variables in PHP echo statements?

When concatenating variables in PHP echo statements, it is best practice to use the period (.) operator to join variables and strings together. This helps to improve readability and maintainability of the code. Additionally, using double quotes ("") allows for interpolation of variables within the string.

// Example of concatenating variables in PHP echo statements
$name = "John";
$age = 30;

echo "My name is " . $name . " and I am " . $age . " years old.";