Parse error, syntax error, unexpected '['

Hi.
I am using WordPress 3.5.1 and I have a plugin with Google Client API.
I have a line of code that works pretty much everywhere (other setups), except this particular environment.

$current_file->getExportLinks()[‘application/pdf’];

Reference: https://developers.google.com/drive/manage-downloads

Error:
Parse error, syntax error, unexpected ‘[‘ in my_file.php on line 123

I am almost sure that this has nothing to do with Google: it works on other machines, and it is a “parse error” not some runtime issue. even wrapping a try catch block won’t help.

Any ideas anyone?