How to join multiple strings into a single string?
How to invoke a user function?
How to take a substring from a given string?
What is file upload?
How to create a table to store files?
How to open a file for reading?
How to get the total number of values in an array?
How to merge values of two arrays into a single array?
How to read a file in binary mode?
How to return a value back to the function caller?
Why do you need to filter out empty files?
How cookies are transported from servers to browsers?
What are the file upload settings in configuration file?
How to send a cookie to the browser?
Steps for the payment gateway processing?