PHP contextual filters

Last updated December 20, 2012. Created by peteruithoven on December 20, 2012.
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When you want to do more advances contextual filtering you could use PHP contextual filter code.

Example:
There is a questions taxonomy with a number of questions.
There is a content type with 2 term reference fields, Raised questions and Answered questions
Under each page I want a list with links to pages that answer questions raised on the page.

1. To get this, create a new view with a block display.
2. Create a contextual filter, on the Answered questions field.
3. Select Provide default value.
4. Select at Type; PHP-code.
5. Use the following code:
6. <?php
  $node = node_load(arg(1));
  if($node && isset($node->field_raised_questions[LANGUAGE_NONE])) {
      foreach($node->field_raised_questions[LANGUAGE_NONE] as $term) {
          $terms[] = $term['tid'];
      }
      return implode('+',$terms);
  }
  else {
      return;
  }

?>
7. Under More, select: Filter to items that share any term.