Description:
------------
Function gethostbyname() not return unmodified hostname in situation when the input string contains only numbers.

Tested in:
PHP 7.0.3
PHP 5.6.18

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

echo gethostbyname('1111111').PHP_EOL;
echo gethostbyname('111').PHP_EOL;
echo gethostbyname('111.111').PHP_EOL;
echo gethostbyname('111768768768768768.com').PHP_EOL;
echo gethostbyname('a111').PHP_EOL;
echo gethostbyname('foo').PHP_EOL;


Expected result:
----------------
0.16.244.71
0.0.0.111
111.0.0.111
111768768768768768.com
a111
foo


Actual result:
--------------
0.16.244.71
0.0.0.111
a111
foo