WordPress获取文章内容第一张图片

自定义方法

functions.php

function catch_first_image() {
    global $post, $posts;
    $first_img = \'\';
    ob_start();
    ob_end_clean();
    $output = preg_match_all(\'/<img.+src=[\\\'\"]([^\\\'\"]+)[\\\'\"].*>/i\', $post->post_content, $matches);
    $first_img = $matches [1] [0];
    if(empty($first_img)) {
        //Defines a default image
        $first_img = \"/wp-content/themes/myui/images/default.jpg\";
    }
    return $first_img;
}

主题

single.php

<img src=\"<?php echo catch_first_image() ?>\"/>