get webpage thumbnails from Google

/**
     * 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 <[email protected]>
     * @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, $img_tag_attributes = "border='1'" ) {
        #initialize
        $use_cache = false;        
        $apc_is_loaded = extension_loaded( 'apc' );

       #set $use_cache
        if ( $apc_is_loaded ) {
            apc_fetch( "thumbnail:" . $site, $use_cache );
}

        if ( !$use_cache )
        {
            $image = file_get_contents( "https://www.googleapis.com/pagespeedonline/v1/runPagespeed?url=$site&screenshot=true" );
            $image = json_decode( $image, true );


            $image = $image[ 'screenshot' ][ 'data' ];
            if ( $apc_is_loaded ) { apc_add( "thumbnail:" . $site, $image, 2400 ); }
        }


        $image = str_replace( array( '_', '-' ), array( '/', '+' ), $image );

        return "<img src=\"data:image/jpeg;base64," . $image . "\" $img_tag_attributes  />";



    }