Description:
------------
Finfo and releated functions throw a Notice for certain files when using php 7.0.2. This is not the case when using 5.6.17.

Test script:
---------------
<?php
$a='#!env python
# -*- coding:utf-8 -*-

from serial import Serial
from sys import exit
';
$finfo = new finfo(FILEINFO_MIME_TYPE);
echo $finfo->buffer($a) . "\n";



Expected result:
----------------
text/x-python

Actual result:
--------------
Notice: Array to string conversion in /home/flo/test.php on line 9
text/x-python