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); ?>