In what circumstances will a city ordinance be invalid because it is in conflict with the state law?

'In Pipoly v. Benson, 20 Cal.2d 366 [125 P.2d 482, 147 A.L.R. 515], a case wherein the court held a Los Angeles city ordinance pertaining to traffic unconstitutional as being in conflict with the state law, the court reviewed generally the different types of situations where local ordinances may be [134 Cal.App.2d Supp. 897] invalid because in conflict with the state law. Although the case is not directly in point inasmuch as it pertains to a situation where the state law was deemed to cover the entire field, thus leaving no room for

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