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<?php
function custom_trim_excerpt($text) {
    $raw_excerpt = $text;
    if ( '' == $text ) {
        $text = get_the_content('');


        $text = strip_shortcodes( $text );


        $text = apply_filters('the_content', $text);
        $text = str_replace(']]>', ']]&gt;', $text);
        $text = strip_tags($text, '<img>'); // um die anzuzeigenden Tags erweitert
        $excerpt_length = apply_filters('excerpt_length', 55);
        $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]');
        $words = preg_split("/[\n\r\t ]+/", $text, $excerpt_length + 1, PREG_SPLIT_NO_EMPTY);
        if ( count($words) > $excerpt_length ) {
            array_pop($words);
            $text = implode(' ', $words);
            $text = $text . $excerpt_more;
        } else {
            $text = implode(' ', $words);
        }
    }
    return apply_filters('wp_trim_excerpt', $text, $raw_excerpt);
}
    remove_filter('get_the_excerpt', 'wp_trim_excerpt');
  add_filter('get_the_excerpt', 'custom_trim_excerpt');
?>