PHP webservice signature

I need to use PHP to invoke an external SOAP web service that resides in a webserver.
The web service requires that a digital signature shall be used to establish the connection.
The web service must have a signature.
Some items on the xml web server file must be encrypted with an AES symmetric key. But when accessing the test environment the web service provider sent us two files
a file with an extension .cer and another one with .pfx extension.
Which of them and how can I use this in my PHP script to build the xml. Is there any example you can send to me?
luciliacoelhoAsked:
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DanUrsoviciuConnect With a Mentor Commented:
As an example on how to use php soap client with certificates:
$wsdl = "service.wsdl";
$cert = "c:\secure_cert\webservice.pem";
$client = new SoapClient($wsdl, array('local_cert' => $cert);

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and you can check more examples on SoapClient manual page

The two files could be the same thing but in different formats. Read the explanations on this link to get an idea and convert certificates between formats.
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