<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<?php
function example($num)
{
return"$num*$num = ".$num*$num;
}
echo example(5);
?>
</body>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文檔</title>
</head>
<body>
<?php
function example($num)
{
return"$num*$num = ".$num*$num;
}
echo example(5);
?>
</body>
</html>
這裏會輸出5*5=25
按值傳遞參數 不影響實參的值
function fun($m)
{
$m=$m*4+8;
echo "在函數內部\$m=".$m;
}
$m=1;
fun($m);
echo"<p>在函數外部\$m=$m<p>";
按引用傳遞方式 影響實參的值
function fun1(&$n)
{
$n=$n*4+8;
echo "在函數內部\$n=".$n;
}
$n=1;
fun1($n);
echo"<p>在函數外部\$n=$n<p>";
默認參數
function fun2($price,$tax=0)
{
$price+=$price*$tax;
echo"價格是$price<br>";
}
fun2(100,0.33);
fun2(100);
