WordPress：从图库中获取第一张图片

发布于 2024-12-02 06:53:17 字数 659 浏览 1 评论 0原文

在我的主页上，我试图输出每个帖子的第一张图像，并且我能够在我的functions.php中使用此代码成功地做到这一点：

function catch_that_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 = "/images/default.jpg";
}
return $first_img;
}

然后我在循环中调用它，如下所示

<img src=”<?php catch_that_image(); ?>” />

：方法是，如果我在同一篇文章中放置画廊，它将不起作用。我很困惑，因为帖子的输出仍然呈现 img 标记，而我的假设是 catch_that_image() 应该捕获该标记？难道我的想法不正确吗？有更好的方法来处理这个问题吗？

原文

On my homepage, I'm trying to output the first image of each post, and I'm able to successfully do that using this code in my functions.php:

function catch_that_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 = "/images/default.jpg";
}
return $first_img;
}

and then I call it in my loop like this:

<img src=”<?php catch_that_image(); ?>” />

The problem with this method is that it won't work if I place a gallery in that same post. I'm confused because the output of the post still renders the img markup, and my assumption is that catch_that_image() should snag that markup? Is my thinking incorrect? Is there a better way to handle this?

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平定天下 2024-12-09 06:53:17

该图库使用 WordPress 短标签放置在您的帖子中。当应用用于转换短标签的过滤器时，短标签被转换为HTML图像标签。

以下方法可能有效，但我不确定：

function catch_that_image() {
global $post, $posts;
$first_img = '';
ob_start();
ob_end_clean();


$transformed_content = apply_filters('the_content',$post->post_content);


$output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $transformed_content, $matches);
$first_img = $matches [1] [0];

if(empty($first_img)){ //Defines a default image
$first_img = "/images/default.jpg";
}
return $first_img;
}

请告诉我这是否有用或者它是否为您指明了正确的方向！

法典链接：

http://codex.wordpress.org/Gallery_Shortcode

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

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

The gallery is placed inside your post using a WordPress short-tag. The shorttag is transformed into HTML-image tags when the filter for transforming the shorttag is applied.

The following might work, but I am not sure:

function catch_that_image() {
global $post, $posts;
$first_img = '';
ob_start();
ob_end_clean();


$transformed_content = apply_filters('the_content',$post->post_content);


$output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $transformed_content, $matches);
$first_img = $matches [1] [0];

if(empty($first_img)){ //Defines a default image
$first_img = "/images/default.jpg";
}
return $first_img;
}

Please let me know if this was useful or if it was pointing you into the right direction!

Codex Links:

http://codex.wordpress.org/Gallery_Shortcode

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

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

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