Description:
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I was using fsockopen in a script, which worked fine until I upgraded from version 4.2.0 to 4.3.4.  Oddly, I found a workaround for the bug by changing my code from:

$fp = fsockopen($server_name, $port, $errno, $errstr);

to:

$fp = fsockopen(gethostbyname($server_name), $port, $errno, $errstr);

Reproduce code:
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fsockopen($server_name, $port, $errno, $errstr);

Expected result:
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Warning: fsockopen(): php_network_getaddresses: getaddrinfo failed: host nor service provided, or not known in /local/apache1.3/htdocs/php_includes/http_post.php on line 45 
Warning: fsockopen(): unable to connect to saturn:81 in /local/apache1.3/htdocs/php_includes/http_post.php on line 45 

(errno=0 and errstr="error 0", I believe)

The reason I believe this is a bug is that:
a) Isn't fsockopen going to do something similiar to gethostbyname() if you pass a hostname and not an IP address to fsockopen?  Why does it work when I pass it an IP address and not the host name?  I would expect gethostbyname to fail also if my problem were external (DNS).
b) everything worked fine until I upgraded PHP today.