To retrieve the alt attribute of an image in WordPress using its URL, you need to leverage WordPress's built-in functions. Here is a sample PHP function that accomplishes this:
In the above code:
$wpdb, WordPress's class for interacting with the database.
IDof the image (a.k.a., the attachment post) whose
guid(Globally Unique Identifier) matches the provided URL. The
guidfield in the WordPress database typically stores the URL of the media file.
ID, we use the
_wp_attachment_image_altas the meta key to fetch the alt text.
This function will return the alt text corresponding to the given image URL. If no alt text is found, it returns an empty string.
Please note that the
guid field in the WordPress database is not always guaranteed to hold the media URL and it should not be used to find the media URL of an attachment. But it's generally reliable for sites that don't change their domain or move their uploaded files after they've been added to the database.