Description:
------------
Some PHP files are marked as 'text/plain', previously 'text/x-php'.

See http://3v4l.org/2ZP6h

Test script:
---------------
<?php

$finfo = new finfo(FILEINFO_MIME_TYPE);

var_dump($finfo->buffer("<?php\nclass A{}"));
var_dump($finfo->buffer("<?php class A{}"));
var_dump($finfo->buffer("<?php\tclass A{}"));
var_dump($finfo->buffer("<?php\n\rclass A{}"));

Expected result:
----------------
string(10) "text/x-php"
string(10) "text/x-php"
string(10) "text/x-php"
string(10) "text/x-php"

Actual result:
--------------
string(10) "text/plain"
string(10) "text/x-php"
string(10) "text/x-php"
string(10) "text/x-php"