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// init.php

$OnParseSocNetComponentP ath = "OnParseSocNetComponentPath";
$OnFillSocNetM enu = "OnFillSocNetMenu";
$OnFillSocNetFeaturesL ist = "OnFillSocNetFeaturesList";

AddEventHandler("socialnetwork", $OnFillSocNetFeaturesList, "setNewFeature");
AddEventHandler("socialnetwork", $OnFillSocNetMenu, "setMenuItem");
AddEventHandler("socialnetwork", $OnParseSocNetComponentPath, "setComponentPath");

function setNewFeature(&$arSocNetFeaturesSettings) {
    $arSocNetFeaturesSettings["testItem"] = [
        "allowed" => [SONET_ENTITY_USER, SONET_ENTITY_GROUP],
        "operations" => [
            "write" => [
                SONET_ENTITY_USER => SONET_RELATIONS_TYPE_NONE,
                SONET_ENTITY_GROUP => SONET_ROLES_MODERATOR
            ],
            "view" => [
                SONET_ENTITY_USER => SONET_RELATIONS_TYPE_ALL,
                SONET_ENTITY_GROUP => SONET_ROLES_USER
            ]
        ],
        "minoperation" => "view"
    ];
    writeToLog(__DIR__."/. ./log/".CURRENT_DATE."setNewFeature.txt", ["arSocNetFeaturesSettings" => $arSocNetFeaturesSettings], "set New Feature");
}

function setMenuItem(&$arResult) {
    $arResult["CanView"]["testItem"] = true;
    $arResult["Urls"]["testItem"] = CComponentEngine::MakePathFromTemplate("/company/personal/user/#user_id#/", [
        "user_id" => $arResult["User"]["ID"]
    ]);
    $arResult["Title"]["testItem"] = "Test item";
    writeToLog(__DIR__."/. ./log/".CURRENT_DATE."setMenuItem.txt", ["arResult" => $arResult], "set menu item");
}



function setComponentPath(&$arUrlTemplates, &$arCustomPagesPath) {
    $arUrlTemplates["testItem"] = "user/#user_id#/testItem/";
    $arCustomPagesPath["testItem"] = "/local/php_interface/tst/";
    writeToLog(__DIR__."/. ./log/".CURRENT_DATE."setComponentPath.txt", ["arUrlTemplates" => $arUrlTemplates, "arCustomPagesPath" => $arCustomPagesPath], "set Component Path");
}

// /local/php_interface/tst/testItem.php

if(!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED!==true)die();

$APPLICATION->IncludeComponent("bitrix:socialnetwork.user_menu" ,"", [
    "PATH_TO_USER" => "index.php?page=user&user_id=#user_id#", 
    "PATH_TO_USER_FRIENDS_ADD" => "user_friends_add.php?page=user_friends_add&user_id=#user_id#", 
    "PATH_TO_MESSAGES_INPUT" => "messages_input.php?page=messages_input&user_id=#user_id#", 
    "PATH_TO_MESSAGE_FORM" => "message_form.php?page=message_form&user_id=#user_id#", 
    "PATH_TO_USER_FRIENDS_DELETE" => "user_friends_delete.php?page=user_friends_delete&user_id=#user_id#", 
    "PATH_TO_USER_FRIENDS" => "user_friends.php?page=user_friends&user_id=#user_id#", 
    "PATH_TO_SEARCH" => "user_search.php", 
    "PATH_TO_USER_GROUPS_ADD" => "group_add.php?page=create&user=#user_id#", 
    "PATH_TO_USER_GROUPS" => "user_groups.php?page=user_groups&user=#user_id#", 
    "PATH_TO_USER_EDIT" => "user_edit.php?page=user_edit&user_id=#user_id#", 
    "PATH_TO_USER_BLOG" => "user_blog.php?page=user_blog&user_id=#user_id#", 
    "PATH_TO_USER_PHOTO" => "user_photo.php?page=user_photo&user_id=#user_id#", 
    "PATH_TO_USER_FORUM" => "user_forum.php?page=user_forum&user_id=#user_id#", 
    "PATH_TO_USER_CALENDAR" => "user_calendar.php?page=user_calendar&user_id=#user_id#",
    "PATH_TO_USER_TASKS" => "", 
    "PATH_TO_USER_FILES" => "user_files.php?page=user_files&user_id=#user_id#", 
    "PAGE_VAR" => "page", 
    "USER_VAR" => "user_id", 
    "PAGE_ID" => "user_testItem",
    "ID" => $arResult["VARIABLES"]["user_id"]
], $component);

Debug($arResult);