<?php
try {
    // Create a new client by providing the endpoint to the constructor.
    $client = new SoapClient(
        null,
        [
            'location'     => 'https://api.sedo.com/api/v1/',
            'soap_version' => SOAP_1_1,
            'encoding'     => 'UTF-8',
            'uri'          => 'urn:SedoInterface',
            'style'        => SOAP_RPC,
            'use'          => SOAP_ENCODED,
        ]
    );

    // Set the values for the array
    $params = [
        'partnerid'        => 1234,
        'signkey'          => 'abcdefghijklmnopqrstuvwxyz0123456789',
        'username'         => 'johndoe',
        'password'         => 'secret',
        'domain'           => 'example.com',
        'market'           => 'eng',
        'relatedlinksdata' => ['Cars', 'House', 'Internet', …],
    ];

    // Call the SOAP method
    $result = $client->SetRelatedLinks($params);

    // Display the result
    while (list ($key, $val) = each($result)) {
        echo "$key => $val<br />\n";
    }
} catch (SoapFault $e) {
    echo 'Error: '.$e->getMessage();
}