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Force the WordPress importer to update existing posts instead of skipping them
<?php
/**
* When using the WordPress Importer, update existing
* posts instead of skipping them. Updates content according
* to the import file even if the existing post was updated
* more recently.
*
* To use, drop this file into your /mu-plugins/ folder or
* copy this code into your functions.php file.
*/
class WPImporterUpdate {
protected $existing_post;
function __construct() {
add_filter( 'wp_import_existing_post', [ $this, 'wp_import_existing_post' ], 10, 2 );
add_filter( 'wp_import_post_data_processed', [ $this, 'wp_import_post_data_processed' ], 10, 2 );
}
function wp_import_existing_post( $post_id, $post ) {
if ( $this->existing_post = $post_id ) {
error_log('old post id found: '. $post_id); // log old post id
if ( get_post_type( $post_id ) == 'attachment' ) { // check if this is attachment
error_log("but " . $post_id . " is an attachement, so ignoring"); // log attachement ignoring
$post_id = $post_id; // if attachment ignore, set post_id to real id
} else {
global $wpdb;
$wpdb->delete( 'wp_postmeta', array( 'post_id' => $post_id ) ); //delete existing meta (assumes import contains all meta needed for post)
$post_id = 0; // force the post to be imported
}
} else {
error_log('new post created.'); // log new post created
}
return $post_id;
}
function wp_import_post_data_processed( $postdata, $post ) {
if ( $this->existing_post ) {
// update the existing post
$postdata['ID'] = $this->existing_post;
}
return $postdata;
}
}
new WPImporterUpdate;
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