The alt
text is stored in the postmeta database table by WordPress, therefore we have to update the postmeta of the given attachment. The reference is done via the unique attachment ID, and the meta_key
we are targeting is the _wp_attachment_image_alt
.
So, to set the alt
text, we can do the following:
update_post_meta($attach_id, '_wp_attachment_image_alt', 'Your alt text');
https://developer.wordpress.org/reference/functions/update_post_meta/
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