Screenshot via Google PageSpeed API

example.php

<?php

include_once 'getGooglePageSpeedScreenshot.php';

echo getGooglePageSpeedScreenshot($_GET['url']);
// Output: <img src="..." border="1" style="width: 80px; height: 80px" />

echo getGooglePageSpeedScreenshot($_GET['url'], [
  'class' => 'thumbnail',
  'style' => ['width: 80px;', 'height: 80px;']
]);
// Output: <img src="..." class="thumbnail" style="width: 80px; height: 80px" />

echo getGooglePageSpeedScreenshot($_GET['url'], [
  'class' => ['thumbnail', 'custom-class'],
  'aria-label' => 'A Thumbnail',
]);
// Output: <img src="..." class="thumbnail custom-class" aria-label="A Thumbnail" />

getGooglePageSpeedScreenshot.php

<?php

/**
 * http_build_attribute
 *   Build HTML tag attributes string with a given array.
 * @param array $attr
 *   An assoc array of attributes with key as attribute name
 *   and value as attribute value(s).
 *
 *   The value can be either an array of string or a string.
 *   If an object is given, it will be cast as string.
 *
 * @return string
 */
function http_build_attributes(array $attr): string
{
    return implode(' ', array_map(function ($key) use ($attr) {
        $value = is_object($attr[$key]) ? (string) $attr[$key] : $attr[$key];
        $value = is_array($value) ? implode(' ', array_map(function ($item) {
            return (string) $item; // cast all second level array value to string.
        }, $value)) : (string) $value;
        return sprintf('%s="%s"', htmlspecialchars($key), htmlspecialchars($value));
    }, array_keys($attr)));
}

/**
 * Get Google Page Speed Screenshot
 *
 * Uses Google's Page Speed API to generate a screenshot of a website. 
 * Returns the image as  a base64 jpeg image tag
 * 
 * Usage Example:
 * echo getGooglePageSpeedScreenshot("http://ghost.org", 'class="thumbnail"');
 * 
 * 
 * @author jaseclamp <https://gist.github.com/jaseclamp>
 * @author <andrew@nomstock.com>
 * @link https://gist.github.com/simpliwp/e6b69e3eb5a3bc1dc081#file-get-webpage-thumbnails-from-google
 * @link https://gist.github.com/jaseclamp/d4ac6205db352e822ff6
 * #ref: http://stackoverflow.com/a/22342840/3306354
 * 
 * 
 * @param string $site The url of the site you want to capture
 * @param string $img_tag_attributes The img tag attributes to add 
 * @return string A base64 coded jpg img tag. Simply echo it out wherever you want the image.
 */
function getGooglePageSpeedScreenshot($site, $attributes = ['border' => '1', 'style' => ['width: 80px;', 'height: 80px;']])
{

    if (empty(trim($site))) {
        return NULL; // for empty $site, return nothing
    }

    // check cache
    $apc_is_loaded = extension_loaded('apc');
    if ($apc_is_loaded) {
        $has_cache = false;
        $cached = apc_fetch("thumbnail:" . $site, $has_cache);
        if ($has_cache) return $cached;
    }

    // check $site for valid URL
    if (filter_var($site, FILTER_VALIDATE_URL) === FALSE) {
        throw new \Exception(sprintf('invalid URL: %s', $site));
        return NULL;
    }

    // get pagespeed API response for the URL
    $response = file_get_contents('https://www.googleapis.com/pagespeedonline/v1/runPagespeed?' . http_build_query([
      'url' => (array_key_exists('path', parse_url($site))) ? dirname($site) : $site,
      'screenshot' => 'true',
    ]));
    $image = json_decode($response, true);
    $image = $image['screenshot']['data'];
    if ($apc_is_loaded) apc_add("thumbnail:" . $site, $image, 2400);

    // render HTML tag for the image.
    $image = str_replace(array('_', '-'), array('/', '+'), $image);
    $html_attributes = http_build_attributes($attributes + [
      'src' => 'data:image/jpeg;base64,' . $image,
    ]);
    return "<img $html_attributes />";
}

?>