PHP simple source code learning

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"; Function directory ($ dir) {$ dp = opendir ($ dir); while ($ file = readdir ($ dp) {if ($ file! = "." & $ File! = ".. ") {$ Path = $ dir. "/". $ file;/* obtain the directory path */if (is_dir ($ path) {/* determine whether a subdirectory exists */directory ($ path ); /* recursive function call */echo"


 ";} Else {printf (''. $ path .'

') ;}} Closedir ($ dp) ;}directory (".") ;?>

 $ Number = "5"; # $ number is a string $ sum = 15 + $ number; # Add an integer and string to produce integer print ("$ sum \ n ");