PHP Functions

例1

<?php

function welcome($name){
echo ' hello ' . $name;
}

echo welcome('zxl');

?>

例2

<?php

function add($num1,$num2){
echo $num1 + $num2;
}

echo add(1,2);

?>

例3

<?php

function subtract($num1,$num2){
$total = $num1 + $num2;
return $total;
}

echo subtract(1,2);

?>

例4

<?php

function z($num1,$num2){
$total 12;
echo $total;
}

z(1,2);
?>