To use single and double quotation marks

Using single and double qutottion mark for numbers.php earliar we reffer. Make below changes and save it quotes.php

Ex: quotes.phps | quotes.php

Notice that I've also use the \$$variable technique to generate result like $3,778.43. (the first dollar sign is prited and the second is the start of the variable name). PHP also supports the heredoc method of quoting text. If you are already familiar with the concept, check the PHP manual for the proper syntex.