original_string: public function create_file_from_string($newfilename, $content, $userid = NULL) {
          if (!$this->is_writable() or !$this->lf->is_directory()) {
              return null;
          }
  
          $newfilename = clean_param($newfilename, PARAM_FILE);
          if ($newfilename === '') {
              return null;
          }
  
          $fs = get_file_storage();
  
          $now = time();
  
          $newrecord = new stdClass();
          $newrecord->contextid = $this->lf->get_contextid();
          $newrecord->component = $this->lf->get_component();
          $newrecord->filearea  = $this->lf->get_filearea();
          $newrecord->itemid    = $this->lf->get_itemid();
          $newrecord->filepath  = $this->lf->get_filepath();
          $newrecord->filename  = $newfilename;
  
          if ($fs->file_exists($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->filename)) {
              // file already exists, sorry
              return null;
          }
  
          $newrecord->timecreated  = $now;
          $newrecord->timemodified = $now;
          $newrecord->mimetype     = mimeinfo('type', $newfilename);
          $newrecord->userid       = $userid;
  
          if ($file = $fs->create_file_from_string($newrecord, $content)) {
              return $this->browser->get_file_info($this->context, $file->get_component(), $file->get_filearea(), $file->get_itemid(), $file->get_filepath(), $file->get_filename());
          }
          return null;
      }
code: public function create_file_from_string($newfilename, $content, $userid = NULL) {
          if (!$this->is_writable() or !$this->lf->is_directory()) {
              return null;
          }
  
          $newfilename = clean_param($newfilename, PARAM_FILE);
          if ($newfilename === '') {
              return null;
          }
  
          $fs = get_file_storage();
  
          $now = time();
  
          $newrecord = new stdClass();
          $newrecord->contextid = $this->lf->get_contextid();
          $newrecord->component = $this->lf->get_component();
          $newrecord->filearea  = $this->lf->get_filearea();
          $newrecord->itemid    = $this->lf->get_itemid();
          $newrecord->filepath  = $this->lf->get_filepath();
          $newrecord->filename  = $newfilename;
  
          if ($fs->file_exists($newrecord->contextid, $newrecord->component, $newrecord->filearea, $newrecord->itemid, $newrecord->filepath, $newrecord->filename)) {
              // file already exists, sorry
              return null;
          }
  
          $newrecord->timecreated  = $now;
          $newrecord->timemodified = $now;
          $newrecord->mimetype     = mimeinfo('type', $newfilename);
          $newrecord->userid       = $userid;
  
          if ($file = $fs->create_file_from_string($newrecord, $content)) {
              return $this->browser->get_file_info($this->context, $file->get_component(), $file->get_filearea(), $file->get_itemid(), $file->get_filepath(), $file->get_filename());
          }
          return null;
      }
code_tokens: public function create_file_from_string ( $ newfilename , $ content , $ userid = NULL ) { if ( ! $ this -> is_writable ( ) or ! $ this -> lf -> is_directory ( ) ) { return null ; } $ newfilename = clean_param ( $ newfilename , PARAM_FILE ) ; if ( $ newfilename === '' ) { return null ; } $ fs = get_file_storage ( ) ; $ now = time ( ) ; $ newrecord = new stdClass ( ) ; $ newrecord -> contextid = $ this -> lf -> get_contextid ( ) ; $ newrecord -> component = $ this -> lf -> get_component ( ) ; $ newrecord -> filearea = $ this -> lf -> get_filearea ( ) ; $ newrecord -> itemid = $ this -> lf -> get_itemid ( ) ; $ newrecord -> filepath = $ this -> lf -> get_filepath ( ) ; $ newrecord -> filename = $ newfilename ; if ( $ fs -> file_exists ( $ newrecord -> contextid , $ newrecord -> component , $ newrecord -> filearea , $ newrecord -> itemid , $ newrecord -> filepath , $ newrecord -> filename ) ) { // file already exists, sorry return null ; } $ newrecord -> timecreated = $ now ; $ newrecord -> timemodified = $ now ; $ newrecord -> mimetype = mimeinfo ( 'type' , $ newfilename ) ; $ newrecord -> userid = $ userid ; if ( $ file = $ fs -> create_file_from_string ( $ newrecord , $ content ) ) { return $ this -> browser -> get_file_info ( $ this -> context , $ file -> get_component ( ) , $ file -> get_filearea ( ) , $ file -> get_itemid ( ) , $ file -> get_filepath ( ) , $ file -> get_filename ( ) ) ; } return null ; }
docstring: Create new file from string - make sure
  params are valid.
  
  @param string $newfilename name of new file
  @param string $content of file
  @param int $userid id of author, default $USER->id
  @return file_info|null new file's file_info instance or null if failed
docstring_tokens: Create new file from string - make sure params are valid .