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My problem:

I'm trying to create a filter that will add the featured image of a post to the_content, so that I can have the first paragraph of the_content displayed before this image.

What I basicly want to achieve:

<p>First Paragraph of the_content</p>
<img>The Post's Featured Image</img>
<p>The rest of the_content</p>

I someone is able to help me.

Thanks in advance!

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3 Answers 3

up vote 1 down vote accepted

You can do this using the 'the_content' filter:

add_filter( 'the_content', insert_featured_image, 20 )

function insert_featured_image( $content ) {
    $content = preg_replace( "/<\/p>/", "</p>" . get_the_post_thumbnail($post->ID, 'post-single'), $content, 1 );
    return $content;
}

Of course, you can add options to the the_post_thumbnail() function to define which size of thumbnail you'd like to use, etc... http://codex.wordpress.org/Function_Reference/the_post_thumbnail

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Hmm, it's inserting the featured image yes, but not after the first paragraph? –  Anders Aug 9 '12 at 2:23
    
Modified to re-add the closing </p> -- if you can provide a URL, I'd be happy to take a peek, otherwise can you post the actual HTML being outputted? –  FlashingCursor Aug 9 '12 at 2:28
    
Also, needs get_the_post_thumbnails and not the_post_thumbnail as the original code showed. Oops. ;-) –  FlashingCursor Aug 9 '12 at 2:32
    
Did you update with the most recent code change above? I accidentally used the_post_thumbnail when I should have used get_the_post_thumbnail, which might have caused your problem. –  FlashingCursor Aug 9 '12 at 2:38
    
Edit: Yes I did. -- Oh, hehe. Hmm well now it isn't showing the image at all. :P –  Anders Aug 9 '12 at 2:38

Technically the quickest solution would be to use a shortcode in your content. Otherwise you'll need a good handle on regex to dump the image between paragraphs using a filter.

Best way would be to add this to functions.php

<?php 

function featured_image($post) {
    if (has_post_thumbnail($post->id))
        the_post_thumbnail('large');
}

add_shortcode('featured_image', 'featured_image');
?>

After your first paragraph in the content just type [featured_image].

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This would definitely be the quickest way yes, but the site is for a client, so I'm afraid this isn't a feasible solution. –  Anders Aug 9 '12 at 1:57

Note -

Using some kind of regex matching you can do this. Here's one of them. Just drop in this snippet in yout theme's functions.php file so that it will print content of variable $img just after first paragraph (i.e. after first occurrence of </p> tag) in your post content.

passing current posts thumbnail / featured image value to $img will print that image after first paragraph.

// Goes into functions.php file
// Adds $img content after after first paragraph (!.e. after first `</p>` tag)
add_filter('the_content', function($content)
{
   $url = wp_get_attachment_url( get_post_thumbnail_id($post->ID) );
   $img = '<img src="'.$url.'" alt="" title=""/>';
   $content = preg_replace('#(<p>.*?</p>)#','$1'.$img, $content, 1);
   return $content;
});

Modified this to append variable after first paragraph.

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I had to change '$1' to '$2' to get it to show the <div>My Image html</div> after the first paragraph - I have obviously no idea why? How do I replace <div>My Image html</div> with the_post_thumbnail('post-single')? If I just insert the_post_thumbnail('post-single') it shows the image before the first paragraph unlike if I insert a random <div>. –  Anders Aug 9 '12 at 2:30
    
it worked perfect on myside, btw updated my code to show featured image. –  amit Aug 9 '12 at 2:40
    
Yay, it worked! :) Thanks a lot (I still had to change '$1' to '$2' though. –  Anders Aug 9 '12 at 2:45
    
instead 'large' use this - 'thumbnail' also make sure you added theme support –  amit Aug 9 '12 at 3:06

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