How did islam influence law and government in the muslim world

The correct answer is the Islamic law code is the Qoran. It teaches and guides you to Worship God and to follow the Teachings of the Prophet, to be a good human being, follow the righteous path so as to achieve the ultimate goal and reward which is a place in heaven in the hereafter. This is the reason why it influences Muslim life, Islam preaches equality of all human beings. It unites human beings in one universal brotherhood. All the Muslims have been declared BROTHERS by Allah Almighty and the Prophet (SAW). The teachings and laws of Islam necessarily unify the Muslim society. Many sayings of the holy Prophet (SAW) make it obligatory on each Muslim to be kind, considerate, helpful, and well wisher of other Muslim broths. 

glad i could help.