Typecho在文章中插入广告代码投放广告

    function themeInit($archive) {
     
    // 判断是否是文章，如果是就插入广告
    $ad_code = '

<div>这是你的广告</div>

';
    if ($archive->is('single')) {
    $archive->content = prefix_insert_after_paragraph( $ad_code, 2, $archive->content );;
    }
    }
     
    // 插入广告所需的功能代码
    function prefix_insert_after_paragraph( $insertion, $paragraph_id, $content ) {
    $closing_p = '

';
    $paragraphs = explode( $closing_p, $content );
    foreach ($paragraphs as $index => $paragraph) {
    if ( trim( $paragraph ) ) {
    $paragraphs[$index] .= $closing_p;
    }
    if ( $paragraph_id == $index + 1 ) {
    $paragraphs[$index] .= $insertion;
    }
    }
    return implode( '', $paragraphs );
    }