_migration_required( $old_url, $new_url ) {
// Do nothing if WordPress is being installed.
if ( wp_installing() ) {
return;
}
// Delete/reset the option if the new URL is not the HTTPS version of the old URL.
if ( untrailingslashit( (string) $old_url ) !== str_replace( 'https://', 'http://', untrailingslashit( (string) $new_url ) ) ) {
delete_option( 'https_migration_required' );
return;
}
// If this is a fresh site, there is no content to migrate, so do not require migration.
$https_migration_required = get_option( 'fresh_site' ) ? false : true;
update_option( 'https_migration_required', $https_migration_required );
}
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