What is "return function " ? Reason for using it ... It's function ?

Answer 1

it use to send data to a new variable where you need that, and suppose you want to use some function that use to get some unique string from a file, and than want to store that string in MySQL.
If you don't use return value, than you have to write it again and again. Writing function for a particular job increase your programing performance.

Answer 2

I have no clue about php, but since it is general logic the answer is: To return a value. For instance you have a function that calculates something for you, so you expect a return value to store the result somewhere. Or you have something that reads or converts a file line by line and you get a string array/list back as return value.

Answer 3

where is the value returned ? why should we return the value ? :'(

Answer 4

return function is used to return the value
,<?php
function subtract($x,$y)
{
return($x-$y);
}
echo subtract(10,5);
?>