您可以提供自己的实现wp_trim_excerpt 它负责修剪和剥离HTML标记（它使用wp_strip_all_tags),

通过复制函数源代码并应用所需的更改（即保留<p> 和<strong> 标签（或您希望的任何其他标签），它将很好地工作。

我为您复制了函数并应用了允许的更改<p> 和<strong> 在你最后的摘录中。(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(\']]>\', \']]>\', $text);
        $num_words = $content_length;
        $more = $excerpt_more ? $excerpt_more : null;
        if ( null === $more ) {
            $more = __( \'…\' );
        }
        $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;
}

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

您的代码应该如下所示：

$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 . \'...\';
endif;