<html>
<head>
<title>Functions</title>
</head>
<body>
<?php
function xin_chao($name = 'ban hien')
{
echo "Xin chao, {$name}!";
}
xin_chao();
?>
</body>
</html>
$names = array('hoangtu', 'tin', 'thang', 'tho', 45, 82);
foreach ($names as $name) {
echo $name . "<br />";
}
foreach ($names as $key => $value) {
echo $key . " " . $value . "<br />";
}
?>
<?php
/*tao function*/
function xin_chao($name)
{
echo "xin chao, {$name}!";
}
xin_chao("chi nga");
/*tao function de loc*/
$chuthuong = "day la mot doan chu thuong";
function strong($txt)
{
echo "<strong>{$txt}</strong>";
}
echo $chuthuong . "<br />";
strong($chuthuong);
/*return de ket thuc 1 gt*/
return $chuthuong;
/*return ve nhieu gt*/
function cong_tru($x, $y)
{
$tong = $x + $y;
$hieu = $x - $y;
