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One of the easiest and most popular uses of custom fields is attaching an image to a post, to spice up listings and such. First, you need to decide what to call your custom field key. Go with post-image, which will be easy to remember. When you see it in your code you ll instantly understand what it is, which is a good thing. Next, you need some data to experiment with. Upload an image to your post using the WordPress image uploader, and then copy the image URL. It will be something like this:
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http://notesblog.com/wp-content/2009/05/splashimage.jpg
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Now, add that to the post-image key using the Custom Fields box on the Write Post screen. If you haven t used the post-image key before, you just type it in the key field; otherwise, you can choose it from the drop-down menu. Then, paste the image URL in the value field, and save. Now you have attached the URL with the post-image key for this particular post, which means that you can use it. Find a place in your theme where you want this image to show, probably along with your posts on the home page or something. It all depends on how you shape the image: it can be anything from a thumbnail that goes to the right of your post s title, or a huge magazine-style photograph that sits behind it. This example shows you how to output the content in the custom field. Later on, this book will discuss more unique approaches. Here s a simple example of putting the custom fields image above the h2 title tag, something a lot of magazine themes like to do, accomplished with just a few additions to the basic loop you ve become accustomed to by now:
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Part I: The WordPress Essentials
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< php if ( have_posts() ) : while ( have_posts() ) : the_post(); > <div id="post-< php the_ID(); >" < php post_class(); >> < php $splashimg = get_post_meta($post->ID, 'post-image', $single = true); > < php if($splashimg !== '') { > <img src="< php echo $splashimg; >" alt="< php { echo the_title(); } >" class="splashimg" /> < php } else { echo ''; } > <h2><a href="< php the_permalink(); >" title="< php the_title(); >">< php the_title(); ></ a></h2> < php the_content(); > </div> < php endwhile; else: > <p>Some error message or similar.</p> < php endif; >
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The third line is a PHP function where you store the variable $splashimg, created by you for this example, with the data from the get_post_meta() function. This is similar to the the_meta() template tag touched on previously, and you re getting three parameters from it. First, there is the post ID of course, which is needed for WordPress to figure out where to collect the custom field data from. Second, you need to request a custom field key and get the value of it, which in this case is post-image. Remember, you named the key just that, so now you ll get the value of the particular post s post-image key, which in turn is the image URL you saved. Finally, the third and last parameter you re passing is setting $single to true. You re doing this to tell get_post_meta() to pass the data as a string. If you set it to false, you would get an array of custom fields data, which of course can come in handy too, but not in this case. All this is stored in $splashimg. Arriving at the third line, you re checking whether there is anything in the $splashimg function, and if there is, you re outputting an image with the source fetched from within the $splashimg.
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< php if($splashimg !== '') { > <img src="< php echo $splashimg; >" alt="< php { echo the_title(); } >" class="splashimg" /> < php } else { echo ''; } > </CODE>
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That is of course the data you got from get_post_meta(); in other words, the custom field data for post-image. Should there not be anything in $splashimg, which would mean that you haven t saved any custom field data for the key post-image, then you echo nothing at all. Maybe you want a default image there instead, in which case you would echo that. After that it is the same standard loop, outputting the linked post title and the content, and so on.
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