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此函数将在每个页面的内容之前或之后放置内容。

function rt_before_after($content) {
    $beforecontent = \'This goes before the content.\';
    $aftercontent = \'And this will come after.\';
    $fullcontent = $beforecontent . $content . $aftercontent;

    return $fullcontent;
}
add_filter(\'the_content\', \'rt_before_after\');