picture bitrix centos 7

function tagPicture($img, $className = 'picture'){

    $arWebpFile = pathinfo($img);

    $webpFile = $_SERVER['DOCUMENT_ROOT'] . "{$arWebpFile["dirname"]}/{$arWebpFile["filename"]}.webp";

    if (!file_exists($webpFile))
    {
        exec("cwebp -q 85 {$_SERVER['DOCUMENT_ROOT']}{$img} -o {$webpFile}");
    }

    $webp = "{$arWebpFile["dirname"]}/{$arWebpFile["filename"]}.webp";

    if ($arWebpFile['extension'] == 'png'){
        $extension = 'png';
    }else{
        $extension = 'jpg';
    }

    $picture = "<picture>
                  <source srcset='{$webp}' type=\"image/webp\">
                  <source srcset=\"{$img}\" type=\"image/{$extension}\">
                  <img class=\"{$className}\" src=\"{$img}\">
                </picture>";

    return $picture;

}

yum install libwebp-tools

кормим функции png или jpg, получаем webp в теге picture