PHP syntax resembles Perl and C

PHP 5 presents many additional OOP (Object Oriented Programming) features.

a. $_FILES['file']['name']: The name of the file as uploaded from the client to the server.
b. $_FILES['file']['type']: The MIME type of the uploaded file. Whether this variable is assigned depends on the browser capabilities.
c. $_FILES['file']['size']: The byte size of the uploaded file.
d. $_FILES['file']['tmp_name']: Once uploaded, the file will be assigned a temporary name before it is moved to its final location.
e. $_FILES['file']['error']: An upload status code.

The explode() function splits a string into a series of substrings, with each string boundary determined by a specific separator.
 
Its prototype: explode(string separator, string string [, int limit]).

Passing arguments by value: 
Means any changes made to those values within the scope of the function are ignored outside of the function.
Passing arguments by reference: 
Means any changes made to those values within the scope of the function are reflected outside of the function.