What are some key considerations when incorporating variables into string output in PHP?

When incorporating variables into string output in PHP, it is important to properly concatenate the variables within the string to ensure they are displayed correctly. One common way to do this is by using double quotes around the string and then placing the variables within curly braces {}. This allows for easy readability and prevents any parsing errors.

// Example of incorporating variables into string output in PHP
$name = "John";
$age = 30;

// Using double quotes and curly braces to incorporate variables
echo "My name is {$name} and I am {$age} years old.";