How to use a different server IP with PHP/cURL?

Question

I have a server with different IPs assigned, how can I specifiy a different IP to be used by cURL?

Answer 1

You will have to use the CURLOPT_INTERFACE option:

The name of the outgoing network interface to use. This can be an interface name, an IP address or a host name.

It can be used in the following manner:

curl_setopt($ch, CURLOPT_INTERFACE, "XXX.XXX.XXX.XXX");

This ofcourse, only accepts IPs and hostnames from your local machine.