I want change custom title in custom wordpress php page

Question

You can make your life a little easier by moving the details fetching to an earlier point in the WordPress loading sequence and wrapping the data in a class. The object initialized from the class can then be used to provide the data to WordPress and to your template with filters.

For example you could have a handler class akin to this.

// Separate file or in functions.php
class My_Product_Details_Handler
{
    protected $product = null;

    public function __construct(int $product_id)
    {
        $this->setupProduct($product_id);
    }

    protected function setupProduct(int $product_id): void
    {
        $rss = simplexml_load_file('https://domain.com/xml');

        foreach ($rss->channel as $channel) {
            foreach ($channel->item as $item) {
                if ($item->id !== $product_id) {
                    continue;
                }

                $this->product = $item;
                break 2; // break both foreach loops
            }
        }
    }

    public function filter_wp_title(string $title, string $sep, string $seplocation): string
    {
        return $this->product ? $this->product->title : $title;
    }

    public function render_product_title(): void
    {
        echo $this->product ? $this->product->title : '';
    }

    public function provide_product_details()
    {
        return $this->product;
    }
}

An object could be created from the class for example on the init action. template_redirect could work too for providing the data to the front end.

// functions.php
add_action('init', 'init_my_product_details_handler');
function init_my_product_details_handler(): void {
    // Are we on the right template?
    if (! is_page_template('product-details.php')) {
        return;
    }
    
    // Get id from the url
    $product_id = !empty($_GET['id']) && is_numeric($_GET['id'])
        ? (int) $_GET['id']
        : 0;

    // Do nothing, if there's no ID
    if (! $product_id) {
        return;
    }

    // Init handler
    $handler = new My_Product_Details_Handler($product_id);

    // Attach handler to relevant hooks
    add_filter( 'wp_title', [$handler, 'filter_wp_title'], 10, 3 );
    
    add_filter( 'my_product_details_data', [$handler, 'provide_product_details'] );
}

Then a small tweak to the template file. Using a filter to get the product data makes the template file a little cleaner looking.

// product-details.php template
<body>
    <?php
        $product_details = apply_filters( 'my_product_details_data', null );
        if ($product_details) {
            // render the details
        } else {
            echo 'No results found;
        }
    ?>
</body>

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