"PHP allows you to use arrays, but PHP arrays are actually associative arrays. Though you can treat them as regular arrays and use contiguous integer indices, they are more flexible than that. Integer indices need to be contiguous or start at zero and you can use strings as indices. In addition, since PHP is dynamically typed, PHP arrays allow mixed types. An array has no fixed type and you can place different mixed types into the same array. PHP arrays are dynamic, so there is no memory management or allocation/deallocation of memory space. Arrays will grow and shrink automatically as you add and remove elements."