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So, PHP can have non-consecutively numerically indexed arrays. The keys have to be of integer (floating point numbers are truncated to integer) or string type, while values can be of arbitrary types, including other arrays and objects. The arrays are heterogeneous: a single array can have keys of different types.
An array data structure can be mathematically modeled as an abstract data structure (an abstract array) with two operations get(A, I): the data stored in the element of the array A whose indices are the integer tuple I. set(A, I, V): the array that results by setting the value of that element to V. These operations are required to satisfy the ...
The expression ((Integer) 42). toString will convert an integer literal to string in Java while 42. ToString () performs the same operation in C#. This is because the latter one is an instance call on the primitive value 42 , while the former one is an instance call on an object of type java.lang.Integer .