How can using single quotes or double quotes affect the performance of PHP scripts?

Using single quotes or double quotes in PHP can affect the performance of scripts because double quotes allow for the interpolation of variables and special characters, which can add overhead to the parsing process. Single quotes, on the other hand, treat everything as a literal string, which can be faster for simple strings that do not require variable interpolation. To improve performance, it's recommended to use single quotes for strings that do not need variable interpolation.

// Example of using single quotes for better performance
$name = 'John Doe';
echo 'Hello, ' . $name;