What is the significance of using single quotes around strings in PHP code?

Using single quotes around strings in PHP code is significant because it indicates that the string should be treated as a literal value without any variable interpolation. This can help improve performance by avoiding unnecessary parsing of variables within the string. Additionally, using single quotes can make the code more readable and prevent potential errors if the string contains special characters that could be misinterpreted.

// Example of using single quotes around a string
$greeting = 'Hello, World!';
echo $greeting;