I have an ACF-field, that gives an output like this:

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p><img class="alignnone size-large wp-image-48" src="http://example.org/wp-content/uploads/2019/01/foo-bar.jpg" alt="" width="1024" height="640" /></p>
<p>Sed lacinia enim a <strong>est aliquet</strong>, et accumsan ex pellentesque. </p>
<p>Adipiscing elit, lorem ipsum dolor sit amet, consectetur.</p>

... Both images and text.

With wp_html_excerpt I can remove all tags, so I get one long text-blurp.

But with WordPress' native excerpts, then it doesn't remove line-breaks or bold text, which I find nice.

How would I go about achieving, getting an excerpt like that, from my ACF-wysiwyg-field?

So ideally, I would call my function like this: create_neat_excerpt( $html, 15 ); and get an output like this (from above-given input):

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p>Sed lacinia enim a <strong>est aliquet</strong>, et accumsan...</p>

Addition: My current attempt

$project_desc = get_field( 'project_description' );

if( !empty( $project_desc ) ):
  $trimmed_text = wp_html_excerpt( $project_desc, 800 );
  $last_space = strrpos( $trimmed_text, ' ' );
  $modified_trimmed_text = substr( $trimmed_text, 0, $last_space );
  echo $modified_trimmed_text . '...';
  • What kind of native excerpts do you have on mind? Jan 15 '19 at 12:45
  • Like on a regular archives-page, where it shows an excerpt, which by default returns 55 words. Source: the_excerpt ... That there removes images, but keeps line-breaks and <strong>-tags.
    – Zeth
    Jan 15 '19 at 13:55
  • @Zeth in the source the_excerpt() you provided, it actually says "An auto-generated excerpt will also have all shortcodes and tags removed." Jan 17 '19 at 5:54

You can provide your own implementation of wp_trim_excerpt which is responsible for trimming and stripping HTML tags (it uses wp_strip_all_tags),

By copying the function source code and applying the change that you want (which is keeping the <p> and <strong> tags (or any additional tags as you wish) and it will work nicely.

I copied the function for you and applied the change of allowing <p> and <strong> to be on your final excerpt. (You should put this code in your functions.php file)

function wp_trim_excerpt_modified($text, $content_length = 55, $remove_breaks = false) {
    if ( '' != $text ) {
        $text = strip_shortcodes( $text );
        $text = excerpt_remove_blocks( $text );
        $text = apply_filters( 'the_content', $text );
        $text = str_replace(']]>', ']]&gt;', $text);
        $num_words = $content_length;
        $more = $excerpt_more ? $excerpt_more : null;
        if ( null === $more ) {
            $more = __( '&hellip;' );
        $original_text = $text;
        $text = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $text );

        // Here is our modification
        // Allow <p> and <strong>
        $text = strip_tags($text, '<p>,<strong>');

        if ( $remove_breaks )
            $text = preg_replace('/[\r\n\t ]+/', ' ', $text);
        $text = trim( $text );
        if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
            $text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
            preg_match_all( '/./u', $text, $words_array );
            $words_array = array_slice( $words_array[0], 0, $num_words + 1 );
            $sep = '';
        } else {
            $words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
            $sep = ' ';
        if ( count( $words_array ) > $num_words ) {
            array_pop( $words_array );
            $text = implode( $sep, $words_array );
            $text = $text . $more;
        } else {
            $text = implode( $sep, $words_array );
    return $text;

Notice the line that is doing the stripping:

Line:22 $text = strip_tags($text, '<p>,<strong>');

And your code should be like this:

$project_desc = get_field( 'project_description' );
if( !empty( $project_desc ) ):
    $trimmed_text = wp_trim_excerpt_modified( $project_desc, 15 );
    $last_space = strrpos( $trimmed_text, ' ' );
    $modified_trimmed_text = substr( $trimmed_text, 0, $last_space );
    echo $modified_trimmed_text . '...';

For more information, you can checkout this answer on stackoverflow it is more detailed.

  • Awesome. Two things, though: 1) The remove_breaks is initially defined in the if-statement. And 2) What does this line do: if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) { $text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
    – Zeth
    Jan 23 '19 at 14:03
  • @Zeth Yes, this is how wordpress is doing the simple action of getting the excerpt and trimming words. the first one though I copied it and it was a parameter in the function .. but forgot to replace it (with false for example). About the second one i just copied it so we don't mess anything up. I will edit the remove_breaks option to be false by default just as wordpress did it in the source code. Jan 23 '19 at 14:15

using apply_filters( 'the_excerpt', get_field( 'project_description' ) ); is close, but it's missing a vital step in getting you where you want. the core excerpt builder runs another filter before it hits the_excerpt. it's get_the_excerpt and on that filter is a call to wp_trim_excerpt() which runs wp_trim_words(). if you look at that function you will see it runs wp_strip_all_tags() before trimming content to 55 words. This is the part you are missing to get your content to look like a regular excerpt without any images. I haven't tested the below but it should work without too much modification needed.

$raw_content = get_field( 'project_description' );
$trimmed_content = wp_trim_words($raw_content);
$clean_excerpt = apply_filters('the_excerpt', $trimmed_content);

echo $clean_excerpt;

Clean that up however you like, I spread it all out for readability.

EDIT: wp_trim_excerpt() only runs all the fun filters if it's pulling from post content. replaced with wp_trim_words()

  • Hmm... It still displays everything from the acf-wysiwyg-field.
    – Zeth
    Jan 15 '19 at 19:11
  • interesting. maybe replace wp_trim_excerpt() with a straight up call to strip_tags() of course then you'll need to trim to the word length you want after but if it's not stripping tags inside that function try doing it first?
    – mrben522
    Jan 15 '19 at 19:48
  • just reread wp_trim_excerpt() when you pass it text that function just dumps out what you gave it instead of cleaning up and filtering. try using wp_trim_words() instead. you may need to pass that through some more filters as well to get it looking right
    – mrben522
    Jan 15 '19 at 19:54
  • Hmm... Now it filters the content (using wp_trim_words). So it trims it to the 55 words and removes images. But it also remove break-lines and <strong>-tags. I don't know if it's my memory toying with me that the regular the_excerpt actually does that as well. But I'm looking for something that keeps newlines and strong-tags.
    – Zeth
    Jan 15 '19 at 23:03
  • 2
    nevermind, Ibrahim's answer is a perfectly good implementation of what I was going to do. use that
    – mrben522
    Jan 16 '19 at 14:10

Use the_excerpt filter (see Codex)

apply_filters( 'the_excerpt', get_field( 'my-wysiwyg-field' ) );

  • I tried it, and I can't get it to work. When I call it from inside the loop, in my single.php-file, then it doesn't change anything. Do I need to create a function and put that in my functions.php? Or can you elaborate on, how I'm supposed to use it?
    – Zeth
    Jan 13 '19 at 11:25
  • 1
    You should update your question to show the code that you are using (don't add it as a reply as it gets a bit messy). My answer just showed the function, as I don't know how your script handles it, but as a bare minimum, add echo to output the filter - echo apply_filters( 'the_excerpt', get_field( 'my-wysiwyg-field' ) );
    – Peter HvD
    Jan 14 '19 at 12:08
  • Thanks for your response. I've added the code now. I did try echoing the filter ( echo apply_filters( 'the_excerpt', $project_desc ), as you suggested, - but it doesn't change anything (it includes images as well, when echoing it out like that).
    – Zeth
    Jan 14 '19 at 12:16

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