[WordPress] Programmatically delete files using WordPress and remove associated post meta data.

delete-the-file.php

<?php

$meta_key = $_REQUEST['meta-key'] . '-fs';

// As long as the meta data for the path to the file on the system exists, we can use it
// to remove the file from the file system.
if ( '' !== ( $fs_url = trim( get_post_meta( $_REQUEST['post_id'], $meta_key, true ) ) ) ) {
	unlink ( $fs_url );
}

programmatically-delete-files.php

<?php

function acme_remove_file() {
	
	if ( wp_verify_nonce( $_REQUEST['nonce'], 'example-jpg-nonce' ) ) {
		
		// Retrieve the meta key. In this example, the key is actually being sent
		// as part of the request; however, it may be the case that you have
		// to generate it based on some type of incoming information from the
		// request if you're using greater security measures, random key generation,
		// or something similar.

		$meta_key = '';
		if ( isset( $_REQUEST['meta-key'] ) && '' !== trim( $_REQUEST['meta-key'] ) ) {
	
			// From the first article, we know that we're storing the value in the file system
			// using the meta key with a '-fs' suffix.
			$meta_key = $_REQUEST['meta-key'] . '-fs';
	
			// As long as the meta data for the path to the file on the system exists, we can use it
			// to remove the file from the file system.
			if ( '' !== ( $fs_url = trim( get_post_meta( $_REQUEST['post_id'], $meta_key, true ) ) ) ) {
				unlink ( $fs_url );
			}
	
			// Next, we'll remove the the rest of the associated meta data from the post
			$meta_key = $_REQUEST['meta-key'];
			delete_post_meta( $_REQUEST['post_id'], $meta_key, true );
	
		} // end if
		
	} // end if
	
}

remove-database-entries.php

<?php

$meta_key = $_REQUEST['meta-key'];
delete_post_meta( $_REQUEST['post_id'], $meta_key );

retrieve-meta-key.php

<?php

// Retrieve the meta key. In this example, the key is actually being sent
// as part of the request; however, it may be the case that you have
// to generate it based on some type of incoming information from the
// request if you're using greater security measures, random key generation,
// or something similar.

$meta_key = '';
if ( isset( $_REQUEST['meta-key'] ) && '' !== trim( $_REQUEST['meta-key'] ) ) {
	
	// From the first article, we know that we're storing the value in the file system
	// using the meta key with a '-fs' suffix.
	$meta_key = $_REQUEST['meta-key'] . '-fs';
	
	// Next, we'll remove the the rest of the associated meta data from the post
	$meta_key = $_REQUEST['meta-key'];
	
} // end if

verify-nonce-value.php

<?php

function acme_remove_file() {
	
	if ( wp_verify_nonce( $_REQUEST['nonce'], 'example-jpg-nonce' ) ) {
		// TODO
	}
	
}