Networking Functions-php

Networking Functions-php PHP Networking Functions-php

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]) 

  host	Hostname or IP address
  port	Port number
  error_number	Reference to a variable that will store the system-level error number if the function fails
  error_string	Reference to a variable that will store the system-level error message if the function fails
  timeout	Number of seconds before the connect system call times out

  Opens a connection to a socket.
  Returns:
  File pointer identifying the open socket; FALSE on failure
  Description:
  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." ?> 

Posted by Hodie J