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I can add product with one feature corretly, but have problem when try add product with more features. How to do it from php? Now i have:
 

$webService = new PrestaShopWebservice(PS_SHOP_URL, PS_SHOP_API_KEY, true);
$root_path = PS_SHOP_URL;

$xml = $webService -> get(array('url' => $root_path.'api/products?schema=blank'));
$resources = $xml->children()->children();

...

$categoriesList = array(2,10,11);

//for categories this loop works perfectly
foreach ($categoriesList as $category){
    $resources->associations->categories->addChild('category')->addChild('id', $category);
}

unset($resources->associations->product_features);

$featuresList[] = array('id' => 6, 'id_feature_value' => 40);
$featuresList[] = array('id' => 7, 'id_feature_value' => 118);

// this loop makes errors

/*
foreach ($featuresList as $feature){
    $resources->associations->product_features->addChild('product_feature')->addChild('id', $feature['id']);
    $resources->associations->product_features->addChild('product_feature')->addChild('id_feature_value', $feature['id_feature_value']);
}

*/

//this works only for one feature
$resources->associations->product_features->product_feature->id = 6;
$resources->associations->product_features->product_feature->id_feature_value = 40;

...

$opt = array('resource' => 'products');
    $opt['postXml'] = $xml -> asXML();
    $xml = $webService -> add($opt);
    $id = $xml->product->id;

Respond when i sent one feature:
 

...
<product_features nodeType="product_feature" api="product_features">
    <product_feature xlink:href="https://mydomain/api/product_features/6">
    <id><![CDATA[6]]></id>
    <id_feature_value xlink:href="https://maydomain/api/product_feature_values/40"><![CDATA[40]]></id_feature_value>
    </product_feature>
</product_features>
...

How obtain some like this?:
 

...
<product_features nodeType="product_feature" api="product_features">
    <product_feature xlink:href="https://mydomain/api/product_features/6">
    <id><![CDATA[6]]></id>
    <id_feature_value xlink:href="https://maydomain/api/product_feature_values/40"><![CDATA[40]]></id_feature_value>
    </product_feature>
    <product_feature xlink:href="https://mydomain/api/product_features/7">
    <id><![CDATA[7]]></id>
    <id_feature_value xlink:href="https://maydomain/api/product_feature_values/118"><![CDATA[118]]></id_feature_value>
    </product_feature>
</product_features>
...

I can add product with one feature corretly but have problem when try add product witch more features. How to do it from php? Now i have:
 

$webService = new PrestaShopWebservice(PS_SHOP_URL, PS_SHOP_API_KEY, true);
$root_path = PS_SHOP_URL;

$xml = $webService -> get(array('url' => $root_path.'api/products?schema=blank'));
$resources = $xml->children()->children();

...

$categoriesList = array(2,10,11);

//for categories this loop works perfectly
foreach ($categoriesList as $category){
    $resources->associations->categories->addChild('category')->addChild('id', $category);
}

unset($resources->associations->product_features);

$featuresList[] = array('id' => 6, 'id_feature_value' => 40);
$featuresList[] = array('id' => 7, 'id_feature_value' => 118);

// this loop makes errors

/*
foreach ($featuresList as $feature){
    $resources->associations->product_features->addChild('product_feature')->addChild('id', $feature['id']);
    $resources->associations->product_features->addChild('product_feature')->addChild('id_feature_value', $feature['id_feature_value']);
}

*/

//this works only for one feature
$resources->associations->product_features->product_feature->id = 6;
$resources->associations->product_features->product_feature->id_feature_value = 40;

...

$opt = array('resource' => 'products');
    $opt['postXml'] = $xml -> asXML();
    $xml = $webService -> add($opt);
    $id = $xml->product->id;

Respond when i sent one feature:
 

...
<product_features nodeType="product_feature" api="product_features">
    <product_feature xlink:href="https://mydomain/api/product_features/6">
    <id><![CDATA[6]]></id>
    <id_feature_value xlink:href="https://maydomain/api/product_feature_values/40"><![CDATA[40]]></id_feature_value>
    </product_feature>
</product_features>
...

How obtain some like this?:
 

...
<product_features nodeType="product_feature" api="product_features">
    <product_feature xlink:href="https://mydomain/api/product_features/6">
    <id><![CDATA[6]]></id>
    <id_feature_value xlink:href="https://maydomain/api/product_feature_values/40"><![CDATA[40]]></id_feature_value>
    </product_feature>
    <product_feature xlink:href="https://mydomain/api/product_features/7">
    <id><![CDATA[7]]></id>
    <id_feature_value xlink:href="https://maydomain/api/product_feature_values/118"><![CDATA[118]]></id_feature_value>
    </product_feature>
</product_features>
...