When using the PHP binaries for Windows that are available from
http://php.net/, the getprotobyname(),
getprotobynumber(), getservbyport(), and
getservbyname() may not function as anticipated under Windows
2000.
DNS resource records:
-
checkdnsrr()
-
getmxrr()
Domain name/IP address lookups and conversions:
-
gethostbyaddr()
-
gethostbyname()
-
gethostbynamel()
-
ip2long()
-
long2ip()
Internet protocol and service information:
-
getprotobynumber()
-
getservbyname()
-
getprotobyname()
-
getservbyport()
PHP 3 debugger (warning: very broken!):
-
debugger_off()
-
debugger_on()
Sockets:
-
fsockopen()
-
pfsockopen()
-
socket_get_status()
-
socket_set_blocking()
-
socket_set_timeout()
gethostbyaddr() gethostbyname() gethostbynamel() getmxrr()
Example:Check whether a given domain name has an MX resource record
<?php $url = "http://www.php.net/"; $component = parse_url ($url); checkdnsrr ($component['host'], 'MX') or die ('No MX record exists for <i>$component[host]</i>. Did you enter the URL correctly?'); echo "MX record found for <i>$component[host]</i>"; ?>
fsockopen
mixed fsockopen(string host, int port, [reference error_number], [reference error_string], [double timeout])
hostHostname or IP addressportPort numbererror_numberReference to a variable that will store the system-level error number if the function failserror_stringReference to a variable that will store the system-level error message if the function failstimeoutNumber of seconds before the connect system call times outOpens a connection to a socket.Returns:File pointer identifying the open socket; FALSE on failureDescription:fsockopen() attempts to open a network socket connection to the specified host and port. TCP connections are assumed by default, but UDP connections can be specified by placing udp:// at the start of the host .There are three optional arguments: error_number , error_string , and timeout . Both the error_number and error_string arguments must be passed as references, as in &$error_number and &$error_string. If an error occurs, these variables will contain an error code and a message. If the error number is 0, this is usually due to a problem that occurs before the socket initializes, such as an incorrect hostname.The timeout argument should contain the maximum number of seconds to wait for a connection before timing out.
open a socket
<?php
$host = 'www.abcxyz.com';
$port = 80;
$fp = fsockopen($host, $port, &$err_no, &$err_msg, 10)
or die ("Could not open a socket connection to host
<i>$host</i> on port <i>$port</i>.
The error message returned was '<i>$err_msg</i>'.");
echo "A socket connection to host <i>$host</i> on port
<i>$port</i> was successfully opened."
?>
