[sumon-cse-sust]

For the WordPress and Woocommerce latest version,Please use like this

add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

function add_custom_price( $cart_object ) {
    foreach ( $cart_object->cart_contents as $key => $value ) {
        $custom_price = 5;
        $value['data']->set_price($custom_price); 
    }
}

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