Expressions And Operators: Casting

Casts in Hack convert values to different types. To assert a type without changing its value, see type assertions.

(float)1; // 1.0
(int)3.14; // 3, rounds towards zero

(bool)0; // false

(string)false; // ""

Casts are only supported for bool, int, float and string. See type conversions to understand what value will be produced.