Problem with Dynamic Meta Description and Keywords

i follow this tutorial:
META Descriptions:

<meta name=”description” content=”

    <?php if (have_posts() && is_single() OR is_page()):while(have_posts()):the_post();

    $out_excerpt = str_replace(array(“\r\n”, “\r”, “\n”), “”, get_the_excerpt());

    echo apply_filters(‘the_excerpt’, $out_excerpt);

    endwhile;

    elseif(is_category() OR is_tag()):

    if(is_category()):

    echo “Posts related to Category:

    “.ucfirst(single_cat_title(“”, FALSE));

    elseif(is_tag()):

    echo “Posts related to Tag:

    “.ucfirst(single_tag_title(“”, FALSE));

    endif;

    else: ?>

    ADD HERE YOUR DEFAULT DESCRIPTION

    <?php endif; ?>” />

META Keywords:

<meta name=”keywords” content=”

    <?php

    $tags = get_tags(array(‘orderby’ => ‘count’, ‘order’ => ‘DESC’));

    $xt = 1;

    foreach ($tags as $tag) {

    if ($xt <= 10) {

    echo $tag->name.”, “;

    }

    $xt++;

    }

    ?>ADD, HERE, YOUR, STATIC, KEYWORDS” />

open graph description:

<meta property="og:description" content="<?php echo strip_tags(get_the_excerpt($post->ID)); ?>" />

i have the same problem, if i have in my “excerpt description” any word with special characters like “”,”,??
example: hello “dog”
when read the expert meta facebook the show only “Hello”(stop the description before the 1st special character) how can i fix that?