seo.php

<?php
namespace Bitrix\Landing\Landing;
 
use \Bitrix\Landing\Manager;
 
class Seo
{
    private static $storedKeys = [
        'title' => null,
        'description' => null,
        'keywords' => null
    ];
 
    private static $changedKeys = [
        'title' => null,
        'description' => null,
        'keywords' => null
    ];
 
    public static function beforeLandingView()
    {
        $application = Manager::getApplication();
 
        foreach (self::$storedKeys as $key => $val)
        {
            $currentVal = $application->getProperty($key);
            if (is_string($currentVal))
            {
                self::$storedKeys[$key] = htmlspecialcharsback($currentVal);
            }
        }
    }
 
    public static function afterLandingView()
    {
        $application = Manager::getApplication();
 
        foreach (self::$storedKeys as $key => $val)
        {
            $newVal = $application->getProperty($key);
            if (is_string($newVal) && $newVal != $val)
            {
                self::$changedKeys[$key] = htmlspecialcharsback($newVal);
            }
        }
    }
 
    public static function processValue($key, $value)
    {
        if (
            is_string($key) &&
            isset(self::$changedKeys[$key])
        )
        {
            return trim(self::$changedKeys[$key]);
        }
 
        return trim($value);
    }
 
    public static function changeValue($key, $value)
    {
        if (
            is_string($key) &&
            is_string($value) &&
            array_key_exists($key, self::$changedKeys)
        )
        {
            self::$changedKeys[$key] = $value;
        }
    }
}