I really don't understand how the "User: Data" field works. Couldn't find any documentation of this.

I want to set the Display format to "A certain key" to output the identifier value from this serialized data (relevant snippet):


When I enter identifier as key, I only get this notice and no output.

Notice: Undefined index: identifier in views_handler_field_serialized->render() (line 60 of www/htdocs/****/sites/all/modules/views/handlers/views_handler_field_serialized.inc).

What do I have to enter in the "Which key should be displayed" field exactly, to display the identifier value?

  • "When I enter identifier as key" - show us your code, we can't tell you what's wrong with it if we can't see it.
    – Mołot
    Jul 1, 2015 at 8:27

2 Answers 2


You need to add an Global PHP field and put the following code in output value to get the identifier field value.

 $result = unserialize($row->data); 
 print $result['identifier'];

Note : You should exclude Data field from display.

Since you very cautious in not using PHP, did you try the following option, change the ckeditor_skin to identifier. But it will produce the output as 76561198181833179['identifier'].

enter image description here

  • 1
    I wanted to avoid PHP in views. I've heard it's bad for performance and is insecure. But when nobody can help me with the "User: Data"-field, I'll fall back to this option. Thanks.
    – Oddy
    Jul 1, 2015 at 8:10
  • I already tried this. It outputs nothing and gives me this notice as stated above: Notice: Undefined index: identifier in views_handler_field_serialized->render() (line 60 of /www/htdocs/*drupalsite*/sites/all/modules/views/handlers/views_handler_field_serialized.inc).
    – Oddy
    Jul 1, 2015 at 8:36

Try %ckeditor_skin in the field 'Which key should be displayed'.

If the error message

Notice: Undefined index: identifier in views_handler_field_serialized-render() (line 60 of /www/htdocs/drupalsite/sites/all/modules/views/handlers/views_handler_field_se‌​rialized.inc).

still exists but the number of the error messages is less than before, try to change the code

return check_plain($value[$this->options['key']])


if (!empty($value[$this->options['key']])) { 
  return check_plain($value[$this->options['key']]);

in line 60 of the module file to avoid the error message.

  • You shouldn't hack core or contributed modules! Feb 21, 2016 at 14:53

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