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Tuesday, June 14. 2005

PHP bind support via stream context Posted by Ilia Alshanetsky in PHP at 22:05

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PHP bind support via stream context

Up until a few days there was no way to tell PHP from which IP address to submit requests when making connections on a multi-ip server. PHP would automatically pick the 1st external IP and use it deliver external data. To address this limitation, I've added a context option that allows to you to bind an IP from the available local IPs and use it, rather then the default to initiate the connection.

PHP:



<?php



$conn = stream_context_create(array('socket'=>array('bindto' => "1.2.3.4:0")));

file_get_contents("http://url", NULL, $conn);



?>

The "socket" wrapper option "bindto" takes a ipv4 or ipv6 address as well as a port, binds the connection to it. Using the port is not necessary in most cases, if you simply wish to bind to a certain IP, specify it followed by ":0" as shown in the example.

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