How to query posts with certain custom meta data, and output Post data

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I’ve been working on modifying the Thesography plugin to include the Google Maps API. So far I’ve had success doing so.

I’m looking to take this one step further and have 1 large Google Map that would display all of my images on 1 map. Then when you hover over a marker, an image thumbnail comes up with the post title. I know the requirements for the Google Maps API to make this possible, but am struggling with trying to get the data out of MySQL.

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I’m looking for some coding help that’ll help me extract the following information from a post, IF it has “latlng_readable” in the post_metadata. For the Google Map, I’d like to be able to grab the post title, the post image URL and the “latlng_readable” meta coordinates for the marker pin.

This way I can put this into the Google Maps API so that in the popup box for my marker is a little thumbnail of the image, as well as the title of that image.

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  1. Trying using WP_Query() using the meta_query arguments.

    Something like this:

    <?php
$geotag_post_query_args = array(
    'meta_key' => 'latlng_readable'
);

$geotagged_posts = new WP_Query( $geotag_post_query_args );
?>

    Now, $geotagged_posts is a query object, that should include all Posts that have the latlng_readable meta field. You can extract the $post data from this object the same as any other query object.