String of array not correctly displayed

Hi! I want to report that if you use print_r command with option TRUE to get the content of an array in the log like this:
$output = print_r($data, TRUE);
error_log(“Insert data:” . $output, 0);
The log viewer only shows this:
Insert data:Array
While the log itself contains:
[02-Sep-2017 14:50:42 UTC] Insert data:Array
(
[user_id] => 3
[username] => tester
[time_login] => 2017-09-02 14:50:42
[ip_address] => 80.100.107.103
[time_last_seen] => 2017-09-02 14:50:42
[browser] => Chrome
[operating_system] => Windows 7
[country_name] => Netherlands
[country_code] => NL
[old_role] => editor
[timezone] => Europe/Amsterdam
)

Can the plug-in be changed that it displays the whole string?

[ No bumping please. ]