What are the best practices for encoding quotes in PHP commands?

When encoding quotes in PHP commands, it is important to use the correct quotation marks to avoid syntax errors. To properly encode quotes within PHP commands, you can use single quotes to wrap the entire string and use double quotes within the string where needed. This ensures that the PHP interpreter understands which quotes are part of the string and which are used for delimiting. Example:

$quote = 'He said, "Hello world!"';
echo $quote;