A function is a block of code that performs a specific task, with the help of
function we can dividing complex or large program into small components
makes program easy to understand and we can find error.
A large program can be divided into different part called modules, where each
module does a specific task so each module is called a function.
Types of functions
Library functions or pre-defined functions
User-defined functions
Library functions or pre-defined functions
PHP library that comes with PHP parser has a collection of various functions
which perform standard and per-defined tasks are called library functions.
User-defined functions
The functions written by the programmer or user to do the specific tasks are called
user defined function or programmer defined function.
