Multiple elements of same name in PHP SOAP Call - php

Question

I know this type of question has been asked a number of times. I have spent several hours reading and trying the offered solutions - but none appear to work for my situation.
I need to send a SOAP request to an API that can contain an element that repeats like so:
<operationNumbers>
<operationNumber>1234</operationNumber>
<operationNumber>1235</operationNumber>
<operationNumber>1236</operationNumber>
<operationNumber>1237</operationNumber>
</operationNumbers>
I did read that perhaps I could do this:
$buildRequest = Array(
'myheader' => Array(
'date' => MY_DATE,
'id' => Array(
'client' => CLIENT,
'clientRef' => MYREF
)
),
'operationNumbers' => Array (
Array('operationNumber' => '1234'),
Array('operationNumber' => '1235')
)
);
$request = $client->__soapCall( 'getMultiOpDets', array($buildRequest) );
Sadly this does not work and results in 'invalid request', if I send in a single operation number eg:
...
'operationNumbers' => Array (
'operationNumber' => '1234'
)
...
The request is successful. I've tried soapVars/soapParams but cannot get it working using this approach. Any hints/tips/help appreciated.

Answer 1

So, I solved it.
$operationNumbersArray = array('1234','1235');
...
'operationNumbers' => array(
'operationNumber' => $operationNumbersArray
)
During my testing and fiddling about, I had inadvertently removed another value that was mandatory. The API did not give warning of it's omission (sadly).

Answer 2

Here is the code I use:
$wsdl = 'https://your.api/path?wsdl';
$client = new SoapClient($wsdl);
$multipleSearchValues = [1, 2, 3, 4];
$queryData = ['yourFieldName' => $multipleSearchValues];
$results = $client->YourApiMethod($queryData);
print_r($results);