“严格标准：只应通过引用传递变量”错误[重复]

Question

This question already has an answer here:

• Strict Standards: Only variables should be passed by reference 6 answers

I am trying to get an HTML-based recursive directory listing based on code here:

http://webdevel.blogspot.in/2008/06/recursive-directory-listing-php.html

Code runs fine but it throws some errors:

Strict Standards: Only variables should be passed by reference in C:\xampp\htdocs\directory5.php on line 34

Strict Standards: Only variables should be passed by reference in C:\xampp\htdocs\directory5.php on line 32

Strict Standards: Only variables should be passed by reference in C:\xampp\htdocs\directory5.php on line 34

Below is the excerpt of code:

else
  {
   // the extension is after the last "."
   $extension = strtolower(array_pop(explode(".", $value)));   //Line 32

   // the file name is before the last "."
   $fileName = array_shift(explode(".", $value));  //Line 34

   // continue to next item if not one of the desired file types
   if(!in_array("*", $fileTypes) && !in_array($extension, $fileTypes)) continue;

   // add the list item
   $results[] = "<li class=\"file $extension\"><a href=\"".str_replace("\\", "/",     $directory)."/$value\">".$displayName($fileName, $extension)."</a></li>
";
  }

</div>

Answer 1

This should be OK

   $value = explode(".", $value);
   $extension = strtolower(array_pop($value));   //Line 32
   // the file name is before the last "."
   $fileName = array_shift($value);  //Line 34