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Function Reference/wp delete attachment

This function deletes an attachment

<?php wp_delete_attachment( $postid ); ?>

To delete an attachment with an ID of '76':

<?php wp_delete_attachment( 76 ); ?>

$postid

(integer) (required) The ID of the attachment you would like to delete.

Default: None

This function fires the delete_attachment action hook, passing the attachment's ID ($postid).