WooCommerce - change order status with php code

Working with woocommerce v4.4, other answers were not working for me. I had to do it this way,

$order = wc_get_order($order_id);
$order->set_status('pending');
$order->save();

Note: Woocommerce internally adds wc prefix, you will see it if you view in the database. We do not need to explicitly add it.

Since Woocommerce version 3.0+ to update status you need to do this

$order = wc_get_order( $order_id );

if($order){
   $order->update_status( 'pending', '', true );
}

Try this code:

$order = new WC_Order($order_id);
$order->update_status('pending', 'order_note'); // order note is optional, if you want to  add a note to order

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