如何通过引用错误解决此问题？

Question

This is part of a drupal module and I am getting this error:

Strict warning: Only variables should be passed by reference in customheaderimage_get_last_argument()

My code is

function customheaderimage_get_last_argument() {
  return customheaderimage_dashtoslash(array_pop(explode('/', $_GET['q'])));
}

q contains a value like "admin/configure/customheaderimage/edit/node--2" the dashtoslash changes the -- to a slash with str_replace. so all of those chained functions return something like 'node/2' and it currently does and works. Just throws this warning

How do I resolve this warning message it does this in a few places?

Answer 1

array_pop() takes an argument by reference:

mixed array_pop ( array &$array )

It needs the reference because it modifies the array passed in as the argument. You're passing the result of a function and not a variable, so the reference doesn't make sense. In other words, you need to pass a variable as the argument.

function customheaderimage_get_last_argument() {
  $arr = explode('/', $_GET['q']);
  return customheaderimage_dashtoslash(array_pop($arr));
}