Complete tutorial for Function in PHP

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What is Function?

Function are those callable section of code that you can pass data to, and that can return data to you. Function are subprograms which are used to compute a value or perform a task.

PHP Functions Tutorial - Learn PHP Programming - YouTube

Which are the Importance of Function?

Easy to debug
Reusability
No code repetition
Easy to handle codes

How to create a Function?

Syntax:-

function function_name( )
{

Block of statement;

}

How to Define, Call & Create a function in PHP? - DevOpsSchool.com

Example:-

Some rules for creating a function:-

Function name only starts with a letter, an underscore ( _ ).
Function name cannot start with a number.
Do not use Predefined constant name e.g. PHP_VERSION ,PHP_OS etc.
Do not use reserved keywords. e.g. else, if etc.
Function names are case-insensitive, though it is usually good form to call functions as they appear in their declaration.

How Function Calls in code

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Ashwani Kumar

Sr. Software Engineer at Cotocus Private Limited

There is no end to education. It is not that you read a book, pass an examination, and finish with education. The whole of life, from the moment you are born to the moment you die, is a process of learning.