wp_trim_excerptを使用してthe_excerpt（）をループの外に取得する

WP 3.3.0以降、抜粋を生成するコンテンツを取得できる場合は、wp_trim_words()が役立ちます.それが誰かに役立つことを願っています、そしてそれはあなた自身の単語カウント機能を作成することを節約します.

http://codex.wordpress.org/Function_Reference/wp_trim_words

Since WP 3.3.0, wp_trim_words() is helpful if you're able to get the content that you want to generate an excerpt for. Hope that's helpful to someone and it saves creating your own word counting function.

http://codex.wordpress.org/Function_Reference/wp_trim_words

wp_trim_excerpt()には、少し奇妙なメカニズムがあります.何かが渡されても、何も実行されません.

その背後にある基本的なロジックは次のとおりです.

• get_the_excerpt()は手動の抜粋をチェックします;
• wp_trim_excerpt()は、手動の抜粋がない場合にチャイムを鳴らし、コンテンツまたはティーザーから抜粋します.

両方はグローバル変数と密接に関連しているため、ループします.

ループの外側では、wp_trim_excerpt()からコードを取り出して、独自のトリム関数を作成することをお勧めします.

wp_trim_excerpt() has a little curious mechanics - if anything is passed to it then it does nothing.

Here is basic logic behind it:

• get_the_excerpt() checks for manual excerpt;
• wp_trim_excerpt() chimes in if there is no manual excerpt and makes one from content or teaser.

Both are tightly tied to global variables and so Loop.

Outside the Loop you are better of taking code out of wp_trim_excerpt() and writing your own trim function.

更新:

これは私が使用したwp_trim_excerpt()の派生物です.完璧に動作します.Wordpressバージョン3.0.4から派生

 function my_excerpt($text, $excerpt)
{
    if ($excerpt) return $excerpt;

    $text = strip_shortcodes( $text );

    $text = apply_filters('the_content', $text);
    $text = str_replace(']]>', ']]>', $text);
    $text = strip_tags($text);
    $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);
}
 

Update:

Here is a derivative of wp_trim_excerpt() which I used. Works perfectly. Derived from Wordpress version 3.0.4

function my_excerpt($text, $excerpt)
{
    if ($excerpt) return $excerpt;

    $text = strip_shortcodes( $text );

    $text = apply_filters('the_content', $text);
    $text = str_replace(']]>', ']]>', $text);
    $text = strip_tags($text);
    $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);
}

これは、投稿オブジェクトまたは投稿IDをパラメーターとして受け取る「trim_excerpt」についての私の見解です.

明らかにコアの内容に基づいています.これ(およびget_the_author())にループ以外の同等のものがない理由がわかりません.

 /**
     * Generates an excerpt from the content, if needed.
     *
     * @param int|object $post_or_id can be the post ID, or the actual $post object itself
     * @param string $excerpt_more the text that is applied to the end of the excerpt if we algorithically snip it
     * @return string the snipped excerpt or the manual excerpt if it exists         
     */
    function zg_trim_excerpt($post_or_id, $excerpt_more = ' [...]') {
        if ( is_object( $post_or_id ) ) $postObj = $post_or_id;
        else $postObj = get_post($post_or_id);

        $raw_excerpt = $text = $postObj->post_excerpt;
        if ( '' == $text ) {
            $text = $postObj->post_content;

            $text = strip_shortcodes( $text );

            $text = apply_filters('the_content', $text);
            $text = str_replace(']]>', ']]>', $text);
            $text = strip_tags($text);
            $excerpt_length = apply_filters('excerpt_length', 55);

            // don't automatically assume we will be using the global "read more" link provided by the theme
            // $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);
    }
 

Here's my take on a "trim_excerpt" that takes the post object or a post ID as a parameter.

Obviously based on what's in core. Don't know why this (and get_the_author()) don't have non-loop equivalents.

/**
     * Generates an excerpt from the content, if needed.
     *
     * @param int|object $post_or_id can be the post ID, or the actual $post object itself
     * @param string $excerpt_more the text that is applied to the end of the excerpt if we algorithically snip it
     * @return string the snipped excerpt or the manual excerpt if it exists         
     */
    function zg_trim_excerpt($post_or_id, $excerpt_more = ' [...]') {
        if ( is_object( $post_or_id ) ) $postObj = $post_or_id;
        else $postObj = get_post($post_or_id);

        $raw_excerpt = $text = $postObj->post_excerpt;
        if ( '' == $text ) {
            $text = $postObj->post_content;

            $text = strip_shortcodes( $text );

            $text = apply_filters('the_content', $text);
            $text = str_replace(']]>', ']]>', $text);
            $text = strip_tags($text);
            $excerpt_length = apply_filters('excerpt_length', 55);

            // don't automatically assume we will be using the global "read more" link provided by the theme
            // $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);
    }

+1からラスト.get_the_excerpt($post-> ID)のようなものがないのは非常に奇妙ですが、そうすべきであることが非常に明白であるはずです.とにかく、ここにワードプレスバージョン3.0.4のwp_trim_excerpt()があります:

http://core.trac wordpress.org/browser/tags/3.0.4/wp-includes/formatting.php

 function wp_trim_excerpt($text) {
1824            $raw_excerpt = $text;
1825            if ( '' == $text ) {
1826                    $text = get_the_content('');
1827    
1828                    $text = strip_shortcodes( $text );
1829    
1830                    $text = apply_filters('the_content', $text);
1831                    $text = str_replace(']]>', ']]>', $text);
1832                    $text = strip_tags($text);
1833                    $excerpt_length = apply_filters('excerpt_length', 55);
1834                    $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]');
1835                    $words = preg_split("/[\n\r\t ]+/", $text, $excerpt_length + 1, PREG_SPLIT_NO_EMPTY);
1836                    if ( count($words) > $excerpt_length ) {
1837                            array_pop($words);
1838                            $text = implode(' ', $words);
1839                            $text = $text . $excerpt_more;
1840                    } else {
1841                            $text = implode(' ', $words);
1842                    }
1843            }
1844            return apply_filters('wp_trim_excerpt', $text, $raw_excerpt);
1845    }
 

1826行目で、get_the_contentsを介して$postグローバル変数にリンクされていることがわかります.そして、はい、私は彼らが何を考えていたのか分かりません.ただし、ここから、独自のmy_excerptでget_the_contentを$textに置き換えると、同様に動作するはずです.

+1 to Rast. It is very weird that there is no such thing as get_the_excerpt($post->ID), when it should be quite obvious that it should. Anyway, here is wp_trim_excerpt() in wordpress version 3.0.4:

http://core.trac.wordpress.org/browser/tags/3.0.4/wp-includes/formatting.php

function wp_trim_excerpt($text) {
1824            $raw_excerpt = $text;
1825            if ( '' == $text ) {
1826                    $text = get_the_content('');
1827    
1828                    $text = strip_shortcodes( $text );
1829    
1830                    $text = apply_filters('the_content', $text);
1831                    $text = str_replace(']]>', ']]>', $text);
1832                    $text = strip_tags($text);
1833                    $excerpt_length = apply_filters('excerpt_length', 55);
1834                    $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]');
1835                    $words = preg_split("/[\n\r\t ]+/", $text, $excerpt_length + 1, PREG_SPLIT_NO_EMPTY);
1836                    if ( count($words) > $excerpt_length ) {
1837                            array_pop($words);
1838                            $text = implode(' ', $words);
1839                            $text = $text . $excerpt_more;
1840                    } else {
1841                            $text = implode(' ', $words);
1842                    }
1843            }
1844            return apply_filters('wp_trim_excerpt', $text, $raw_excerpt);
1845    }

You can see on line 1826 that it is linked to the $post global variable via get_the_contents. And yes, I have no idea what were they thinking. But from here, replace the get_the_content with $text in your own my_excerpt, and it should behave in a similar fashion.

get_the_content()関数は、$more！=0の場合、完全なコンテンツを返します. get_the_content()関数が抜粋を返すようにするには、グローバル変数$moreを0に設定する必要があります.

変更されたwp_trim_excerpt()関数:

 function wp_trim_excerpt($text) {
    $raw_excerpt = $text;
    if ( '' == $text ) {
        global $more;
        $tmp = $more;
        $more = 0;
        $text = get_the_content('');
        $more = $tmp;

        $text = strip_shortcodes( $text );

        $text = apply_filters('the_content', $text);
        $text = str_replace(']]>', ']]>', $text);
        $text = strip_tags($text);
        $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);
}
 

The get_the_content() function would return full content if $more != 0. You have to set global variable $more to 0 to make sure get_the_content() function return excerpt.

Modified wp_trim_excerpt() function:

function wp_trim_excerpt($text) {
    $raw_excerpt = $text;
    if ( '' == $text ) {
        global $more;
        $tmp = $more;
        $more = 0;
        $text = get_the_content('');
        $more = $tmp;

        $text = strip_shortcodes( $text );

        $text = apply_filters('the_content', $text);
        $text = str_replace(']]>', ']]>', $text);
        $text = strip_tags($text);
        $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);
}

上記の他の回答を使用して、うまくいくと思われる簡単な回答を次に示します.

 global $post;

$excerpt = apply_filters('get_the_excerpt', get_post_field('post_excerpt', $post->ID));

if ( $excerpt == '' ) {
    $excerpt = wp_trim_words( $post->post_content, 55 );
}
 

OpenGraphの説明を定義する関数の<meta>タグで使用しています.だから私はただ追加します:

 <meta property="og:description" content="<?php echo esc_html( $excerpt ); ?>" />
 

Using others' answers above, here's a simpler answer that seems to work well:

global $post;

$excerpt = apply_filters('get_the_excerpt', get_post_field('post_excerpt', $post->ID));

if ( $excerpt == '' ) {
    $excerpt = wp_trim_words( $post->post_content, 55 );
}

I'm using it in the <meta> tags in a function to define OpenGraph descriptions. So then I just add:

<meta property="og:description" content="<?php echo esc_html( $excerpt ); ?>" />