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<?php
/* Hook to 'add_meta_boxes' with lower priority. */
add_action( 'add_meta_boxes', 'idxbroker_remove_wpseo_metabox', 11 );
/**
 * Remove WordPress seo meta box.
 */
function idxbroker_remove_wpseo_metabox() {
    if ( get_post_type() == 'idx-wrapper' ) {
        remove_meta_box( 'wpseo_meta', 'idx-wrapper', 'normal' );
        remove_meta_box( 'sharing_meta', 'idx-wrapper', 'advanced');
    }
}