Array Dereference in PHP 5.4

Found this out when deploying my new app into server. I used PHP 5.4 in my local machine, and unfortunately its 5.3 in my server. The app was blank and the log inform me:

PHP Parse error:  syntax error, unexpected '[', expecting ')' in /some/file.php on line 114

We need a temporary variable to fix it:

// a function returning array()
getAll() {
    return array( 1, 2, 3 );
}

// in PHP 5.4, we can simply:
$first_number = getAll()[0];

// my fix:
$numbers = getAll();
$first_number = $numbers[0];