If the file is opened for reading, this function is emulated but can be extremely slow. If the file is opened for writing, only forward seeks are supported gzseek then compresses a sequence of zeroes up to the new starting position.

To access arguments, it's necessary for each argument to have a clearly defined type. Again, PHP's extremely dynamic nature introduces some quirks. Because PHP never does any kind of type checking, it's possible for a caller to pass any kind of data to your functions, whether you want it or not. If you expect an integer, for example, the caller might pass an array, and vice versa PHP simply won't notice.