Function

  • A function is a way of wrapping up a some part of code(Chunk) and giving that small name(Chunk), so that you can use chunk that later in just one line of code.

  • It is more useful when using code morethan one place.
Syntax :
function function-name ($argument-1, $argument-2, ..)
{
	statement-1;
	statement-2;
	...
}


PHP Functions - Adding parameters

Example :
<?php
function writeName($fname)
{
echo $fname . " Hi.
";
}

echo "My name is ";
writeName("Siddle");
echo "My sister's name is ";
writeName("Lita");
echo "My brother's name is ";
writeName("Peter");
?>
Output :
My name is Siddle Hi.
My sister's name is Lita Hi.
My brother's name is Peter Hi.


PHP Functions - Return values

Example :
<?php
function add($x,$y)
{
$total=$x+$y;
return $total;
}
echo "2 + 18 = " . add(2,18);
?>
Output :
2 + 18 = 20