Code for https://www.youtube.com/watch?v=IlRFQv_AYZU

proxy.php

<?php

function validateURL($url)
{
    if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
        // Parse the URL to get its components
        $parsedUrl = parse_url($url);

        // Check the scheme
        if (in_array($parsedUrl['scheme'], ['http', 'https'])) {
            return true;
        }
    }

    return false;
}

// Check if the 'url' GET parameter is set
if (isset($_GET['url']) && validateURL($_GET['url'])) {
    $url = $_GET['url'];

    // Initialize a cURL session
    $curl = curl_init($url);

    // Set cURL options
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);  // Return the transfer as a string
    curl_setopt($curl, CURLOPT_HEADER, false);         // Do not include the header in the output
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);  // Follow redirects
    curl_setopt($curl, CURLOPT_MAXREDIRS, 5);          // Maximum number of redirects to follow
    curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1'); // Set a user agent

    // Execute the cURL session
    $html = curl_exec($curl);

    // Check for errors
    if (curl_errno($curl)) {
        echo 'Curl error: '.curl_error($curl);
    } else {
        // Output the fetched HTML
        echo $html;
    }

    // Close the cURL session
    curl_close($curl);
} else {
    echo "No URL provided!";
}