Display info from custom fields in all images’ HTML

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Okay, I’ve been working on this all day and can’t find the solution anywhere. I’ve created a custom field within the image upload screen (info first found here). The field stores the name of a photographer to give him/her credit. Everything’s fine there.

What I can’t figure out is how to get this information into every image’s title data across the site. I want my field for Image Credit to append itself to all image titles across the site, so each image title would read something like “My Title (by Photographer Name)”.

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What I have figured out is close, but not quite good enough. I can get the information from my custom field by using “get_children()” of type “image” on the existing post, and then calling “get_post_meta()” for my custom field name on each result. I can then use this information to add it to the post featured images by altering the title properties within “get_the_post_thumbnail()” when I call it. What I need is to be able to do something like this site-wide on all images, not just the featured ones.

I feel like there should be somewhere in the Core that defines how images are displayed. Perhaps I could overwrite this with a same-name file in my own theme, or by declaring a function to override the default behavior. Maybe there’s a filter or a hook I could use. However, I can’t find any documentation to help me, and I’m about out of ideas.

Any and all thoughts would be much appreciated, even if they’re just partial ideas.

Note: I tried to link all my functions for easy reference, but spam-prevention wouldn’t let me post that many links so I’ll list them here instead:

  • codex.wordpress.org/Function_Reference/get_children
  • codex.wordpress.org/Function_Reference/get_post_meta
  • codex.wordpress.org/Function_Reference/get_the_post_thumbnail
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2 comments

  1. You can create a filter using the “wp_get_attachment_image_attributes” hook. Place this in your functions.php file.

    function filter_image_title($attr, $attachment = null){
        //Find your $photographer with $attachment->ID
        $attr['title'] .= ' (' . __('Photographed by', 'foobar') . ' ' . $photographer . ')';
        return $attr;
}
add_filter('wp_get_attachment_image_attributes', 'filter_image_title', 10, 2);

  2. Thanks to @Brian, I’ve written the following. However, for some reason this is still only affecting featured images. If the post has no featured image, it does not affect the first image as I might have expected. I completely commented out my previous code which was designed to affect the featured image, so it can’t be a holdover. Any ideas?

    function filter_image_title($attr, $attachment = null){
    //Find photo credit with $attachment->ID
    $attachment_credit = get_post_meta($attachment->ID, '_waz-image-credit', true);

    //Store original image info
    $attr['title'] = get_post($attachment->ID)->post_title;
    $attr['alt'] = get_post_meta($attachment->ID, '_wp_attachment_image_alt', true);

    //If there's no ALT text, use the title (pre-credit addition)
    if(!$attr['alt'])
        $attr['alt'] = $attr['title'];

    //If a credit has been added to the image, add this to the title
    if($attachment_credit) 
        $attr['title'] .= ' (' . 'Photographed by' . ' ' . $attachment_credit . ')';

    return $attr;
}
add_filter('wp_get_attachment_image_attributes', 'filter_image_title', 10, 2);