实例 3-29 从URL 中取出域名
本实例演示了如何从URL 中取出域名，如代码3-29 所示。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> preg_match_3.php </title>
<meta charset="UTF-8">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head> <body>
<?php
// 从 URL 中取得主机名
preg_match("/^(http:\/\/)?([^\/]+)/i",
"http://www.php.net/index.html", $matches);
//获取主机名
$host = $matches[2];
// 从主机名中取得后面两段得到域名
preg_match("/[^\.\/]+\.[^\.\/]+$/", $host, $matches);
echo "域名为: {$matches[0]}\n";
?>
</body>
</html>域名为: php.net
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> preg_match_3.php </title>
<meta charset="UTF-8">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head> <body>
<?php
// 从 URL 中取得主机名
preg_match("/^(http:\/\/)?([^\/]+)/i",
"http://www.php.net/index.html", $matches);
var_dump($matches);
//获取主机名
$host = $matches[2];
var_dump($host);
// 从主机名中取得后面两段得到域名
preg_match("/[^\.\/]+\.[^\.\/]+$/", $host, $matches);
var_dump($matches);
echo "域名为: {$matches[0]}\n";
?>
</body>
</html>
array
0 => string 'http://www.php.net' (length=18)
1 => string 'http://' (length=7)
2 => string 'www.php.net' (length=11)string 'www.php.net' (length=11)
array
0 => string 'php.net' (length=7)域名为: php.net
