Description:
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The SOAP extension does not allow you to both use a WSDL file and specify a custom endpoint. Some SOAP servers, including eBay, set a generic endpoint in their WSDL, and require the developer to override it with custom data.

By endpoint, I mean the location field as described here:

http://www.w3.org/TR/wsdl#_soap:address

Reproduce code:
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$client = new SoapClient('some.wsdl', array('location' => 'http://localhost/soap.php'));

It is also necessary to have a setLocation() method, because it's common to need to modify the endpoint/location from request to request. Without this, the developer would need to create a second instance of SoapClient with the same WSDL.

$client->__setLocation('http://localhost/soap2.php');

Expected result:
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The location from the WSDL is set to http://localhost/soap.php instead of what's in the file.

Actual result:
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The location parameter is ignored.