What is the best practice for replacing parts of a string in PHP with variables stored in the same string?

When replacing parts of a string in PHP with variables stored in the same string, the best practice is to use double quotes for the string so that variables can be directly embedded within it using curly braces. This ensures that the variables are properly interpolated and replaced within the string.

$name = "Alice";
$age = 30;

// Using double quotes to embed variables within the string
$message = "Hello, my name is {$name} and I am {$age} years old.";

echo $message;