Create function

What is User Defined Function (UDF) in PHP?

A UDF or User Defined Function in PHP can act as a procedure (void function) . A UDF must be declared with key word ‘function’ ,we can return statement or values if required .

To UnderstandUser Defined Function in PHP UDF  lets take an example


<?php

function  sayhi()

{
echo "Hi!";
echo "Hello";

}
sayhi();

?>

<?php

function  addnum($x,$y)

{
return ($x+$y);

}
sayhi();

addnum(2,3);

///output will be 5

?>

Above are the two example of User Defined Function UDF in PHP  in first example output returns statement while in other integer value.