Disable certificate verification in PHP SoapClient

$context = stream_context_create(array(
    'ssl' => array(
        // set some SSL/TLS specific options
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
));

$client  = new SoapClient(null, array( 
    'location' => 'https://...',
    'uri' => '...', 
    'stream_context' => $context
));