How Set Image URL As Featured Image? - php

Question

I have article with title "POST-TITLE" and I create image title same with post title, "POST-TITLE.jpg".
All image I put in my hosting, like this:
http://www.example.com/img/CATEGORY/POST-TITLE.jpg
In mytheme post-single.php, I have this code:
<img src="http://www.example.com/img/<?php foreach((get_the_category()) as $category) { echo $category->cat_name . ''; } ?>/<?php the_title(); ?>.jpg" onError="this.src='http://cerpenkoran.net/img/dot.jpg';" title="Thumb for <?php the_title(); ?>" >
My answer:
What code I add the image url code above, so it as Featured Image?
OR how to combine this fix URL:
http://www.example.com/img/<?php foreach((get_the_category()) as $category) { echo $category->cat_name . ''; } ?>/<?php the_title(); ?>.jpg
with this Featuread Image code:
<?php if (has_post_thumbnail( $post->ID )) : ?>
<?php $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' ); ?>
<img src="<?php echo $image[0]; ?>" />
<?php endif; ?>

Answer 1

Are you asking how to add a Featured Image to your WordPress website? If so, then follow the below instructions:
Firstly, you are going to need to add the relevant Theme Support inside your functions.php file. To achieve this, go into your functions.php file and enter the following code:
<?php
function my_theme_name_support(){
add_theme_support('post-thumbnails');
}
add_action('after_setup_theme', 'my_theme_name_support');
?>
Make sure that the above code is placed after the opening <?php tag (at the top of the functions.php file) but before the closing ?> tag (at the bottom of the functions.php file.)
You will see that there are two my_theme_name_support entries. You can change the wording of these to something more appropriate. Just make sure they match.
Now, head into your WordPress Dashboard and go to create a New Page or New Post. You should now be able to see an entry, entitled 'Featured Image'. As you scroll the page, you should see it appear on the right hand side. Simply select the link and add the required image.
This, alone, does not output the Featured Image. To output your Featured Image, you now need to enter the following code into the relevant file(s) on your server:
<?php the_post_thumbnail('thumbnail'); ?>
By following the above steps, you should now be able to dynamically call your Featured Images from your WordPress Dashboard and output them to whichever pages you want.
For more information, on Featured Images, check out this WordPress Codex Article >>>
Answer Extension
If you want the same image to appear for every Blog Post, so that you do not have to manually add a Featured Image to every Blog Post, you could:
Upload the image to WordPress, via their Media Uploader.
Then head to the single.php Blog Post Template File and enter the following code:
<img src="POST-TITLE.jpg" alt="post-title" height="42" width="42">
Be sure to make the following modifications, to the above code:
src: This is the link to the actual image. Therefore, change 'POST-TITLE.jpg' to the name of your desired image. Be sure to include the correct image format (.jpg, .png etc).
alt: This is a brief description of the image. No coding required here. Plain text will do.
height and width: Insert the correct dimensions. The dimensions are in pixels.
Please Note ...
single.php is the default Blog Post Template File. There is a chance that there are additional Blog Post Template files too. If this is the case, you will need to add the code to these other Template Files too.
You may find this WordPress Article, helpful, when working with Template Files.