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SoapHeader::SoapHeader in PHP is used to add SOAP headers to a SOAP request. SOAP headers contain additional information that needs to be sent along with a SOAP message, such as authentication credentials or application-specific data.

Here's an example to illustrate how to use SoapHeader::SoapHeader:

php
<?php
// Create a new SOAP client
$client = new SoapClient("http://example.com/soap.wsdl");

// Create a new SoapHeader object
$header = new SoapHeader('http://example.com/namespace', 'HeaderName', 'HeaderValue');

// Add the header to the SOAP client
$client->__setSoapHeaders($header);

// Call a SOAP method
$result = $client->someMethod();

// Process the result
// ...
?>


In the example above:
- We create a new SoapClient object with the URL of the SOAP server's WSDL file.
- Next, we create a new SoapHeader object by providing the namespace, header name, and header value.
- We add the header to the SOAP client using the __setSoapHeaders() method.
- Finally, we call a SOAP method on the client object and process the result.

Please note that the values used in the example are placeholders and should be replaced with the actual namespace, header name, header value, and SOAP endpoint URL that you are working with.