original_string: public function containsFilter($haystack, $needle)
      {
          if (empty($needle)) {
              return $haystack;
          }
  
          return (strpos($haystack, (string) $needle) !== false);
      }
code: public function containsFilter($haystack, $needle)
      {
          if (empty($needle)) {
              return $haystack;
          }
  
          return (strpos($haystack, (string) $needle) !== false);
      }
code_tokens: public function containsFilter ( $ haystack , $ needle ) { if ( empty ( $ needle ) ) { return $ haystack ; } return ( strpos ( $ haystack , ( string ) $ needle ) !== false ) ; }
docstring: determine if a string contains another
  
  @param string $haystack
  @param string $needle
  
  @return bool
docstring_tokens: determine if a string contains another