PHP：单个 Function 可以执行多个命令吗？

Question

我使用这个代码片段在第三段之后插入广告，它工作得很好。

//Insert ads after third paragraph
add_filter( 'the_content', 'third_paragraph_ads' );
function third_paragraph_ads ( $content ) {
    $ad_code1 = 'AD CODE HERE';
    if ( is_single() && ! is_admin() ) {
        return insert_third_paragraph_ads( $ad_code1, 3, $content );
    }
    return $content;
}

// Parent Function for third paragraph Ads
function insert_third_paragraph_ads( $insertion, $paragraph_id, $content ) {
    $closing_p = '</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 );
}

但是，如何使用相同的 function 在第 3、6 和 9 段之后插入广告？

这样的事情会让你对这个问题有一个更好的了解（虽然既不起作用也没有意义）：

//Insert ads after third paragraph
add_filter( 'the_content', 'third_paragraph_ads' );
function third_paragraph_ads ( $content ) {
    $ad_code1 = 'AD CODE HERE1';
    if ( is_single() && ! is_admin() ) {
        return insert_third_paragraph_ads( $ad_code1, 3, $content );
    }
$ad_code2 = 'AD CODE HERE2';
    if ( is_single() && ! is_admin() ) {
        return insert_third_paragraph_ads( $ad_code1, 6, $content );
    }
    $ad_code3 = 'AD CODE HERE3';
    if ( is_single() && ! is_admin() ) {
        return insert_third_paragraph_ads( $ad_code1, 9, $content );
    }
    return $content;
}

// Parent Function for third paragraph Ads
function insert_third_paragraph_ads( $insertion, $paragraph_id, $content ) {
    $closing_p = '</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 );
}

Answer 1

如果其他人面临同样的挑战，我想通了并想分享解决方案：

//Insert ads after third paragraph
add_filter( 'the_content', 'third_paragraph_ads' );
function third_paragraph_ads ( $content ) {
    $ad_code = 'Ads code 1';
    $ad_code2 = 'Ads code 2';
    $ad_code3 = 'Ads code 3';
        if ( is_single() && ! is_admin() ) {
            $content = insert_third_paragraph_ads( $ad_code, 2, $content );
            $content = insert_third_paragraph_ads( $ad_code2, 6, $content );
            $content = insert_third_paragraph_ads( $ad_code3, 8, $content );
                return $content;
            }
            return $content;
}

// Parent Function for third paragraph Ads
function insert_third_paragraph_ads( $insertion, $paragraph_id, $content ) {
    $closing_p = '</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 );
}