original_string: public static function instance($courseid, $strictness = MUST_EXIST) {
          global $DB;
  
          if ($context = context::cache_get(CONTEXT_COURSE, $courseid)) {
              return $context;
          }
  
          if (!$record = $DB->get_record('context', array('contextlevel' => CONTEXT_COURSE, 'instanceid' => $courseid))) {
              if ($course = $DB->get_record('course', array('id' => $courseid), 'id,category', $strictness)) {
                  if ($course->category) {
                      $parentcontext = context_coursecat::instance($course->category);
                      $record = context::insert_context_record(CONTEXT_COURSE, $course->id, $parentcontext->path);
                  } else {
                      $record = context::insert_context_record(CONTEXT_COURSE, $course->id, '/'.SYSCONTEXTID, 0);
                  }
              }
          }
  
          if ($record) {
              $context = new context_course($record);
              context::cache_add($context);
              return $context;
          }
  
          return false;
      }
code: public static function instance($courseid, $strictness = MUST_EXIST) {
          global $DB;
  
          if ($context = context::cache_get(CONTEXT_COURSE, $courseid)) {
              return $context;
          }
  
          if (!$record = $DB->get_record('context', array('contextlevel' => CONTEXT_COURSE, 'instanceid' => $courseid))) {
              if ($course = $DB->get_record('course', array('id' => $courseid), 'id,category', $strictness)) {
                  if ($course->category) {
                      $parentcontext = context_coursecat::instance($course->category);
                      $record = context::insert_context_record(CONTEXT_COURSE, $course->id, $parentcontext->path);
                  } else {
                      $record = context::insert_context_record(CONTEXT_COURSE, $course->id, '/'.SYSCONTEXTID, 0);
                  }
              }
          }
  
          if ($record) {
              $context = new context_course($record);
              context::cache_add($context);
              return $context;
          }
  
          return false;
      }
code_tokens: public static function instance ( $ courseid , $ strictness = MUST_EXIST ) { global $ DB ; if ( $ context = context :: cache_get ( CONTEXT_COURSE , $ courseid ) ) { return $ context ; } if ( ! $ record = $ DB -> get_record ( 'context' , array ( 'contextlevel' => CONTEXT_COURSE , 'instanceid' => $ courseid ) ) ) { if ( $ course = $ DB -> get_record ( 'course' , array ( 'id' => $ courseid ) , 'id,category' , $ strictness ) ) { if ( $ course -> category ) { $ parentcontext = context_coursecat :: instance ( $ course -> category ) ; $ record = context :: insert_context_record ( CONTEXT_COURSE , $ course -> id , $ parentcontext -> path ) ; } else { $ record = context :: insert_context_record ( CONTEXT_COURSE , $ course -> id , '/' . SYSCONTEXTID , 0 ) ; } } } if ( $ record ) { $ context = new context_course ( $ record ) ; context :: cache_add ( $ context ) ; return $ context ; } return false ; }
docstring: Returns course context instance.
  
  @static
  @param int $courseid id from {course} table
  @param int $strictness
  @return context_course context instance
docstring_tokens: Returns course context instance .