A Philippine anti-corruption court ordered the arrest of a prominent senator on Friday over allegations he pocketed a kickback of millions of dollars in a flood-control project, in the latest crisis to entangle the Senate. Senator Jinggoy Estrada surrendered and posted bail before the Sandiganbayan court, allowing him to remain free while the case proceeds. The court barred Estrada from leaving the country while facing the first of two corruption-related charges in relation to the flood control.