php获取根域名方法汇总
如果你只简单获取当前访问你页面的域名,我们只需要使用php中的函数HTTP_HOST就可以搞定了,如果是提取url根域名是需要正则的,下面就来看看几个具体实例。
如果是获取当前域名是非常的简单的:
代码如下:
//获取当前的域名:
echo $_SERVER['SERVER_NAME'];
//获取来源网址,即点击来到本页的上页网址
echo $_SERVER["HTTP_REFERER"];
$_SERVER['REQUEST_URI'];//获取当前域名的后缀
$_SERVER['HTTP_HOST'];//获取当前域名
dirname(__FILE__);//获取当前文件的物理路径
dirname(__FILE__)."/../";//获取当前文件的上一级物理路径
?>
例子1
代码如下:
function getUrlRoot($url){
#添加头部和尾巴
$url = $url . "/";
#判断域名
preg_match("/((\w*):\/\/)?\w*\.?([\w|-]*\.(com.cn|net.cn|gov.cn|org.cn|com|net|cn|org|asia|tel|mobi|me|tv|biz|cc|name|info))
\//", $url, $ohurl);
#判断IP
if($ohurl[3] == ''){
preg_match("/((\d+\.){3}\d+)\//", $url, $ohip);
return $ohip[1];
}
return $ohurl[3];
}
例子2
代码如下:
/**
* 取得根域名
* @param type $domain 域名
* @return string 返回根域名
*/
function GetUrlToDomain($domain) {
$re_domain = '';
$domain_postfix_cn_array = array("com", "net", "org", "gov", "edu", "com.cn", "cn");
$array_domain = explode(".", $domain);
$array_num = count($array_domain) - 1;
if ($array_domain[$array_num] == 'cn') {
if (in_array($array_domain[$array_num - 1], $domain_postfix_cn_array)) {
$re_domain = $array_domain[$array_num - 2] . "." . $array_domain[$array_num - 1] . "." . $array_domain[$array_num];
} else {
$re_domain = $array_domain[$array_num - 1] . "." . $array_domain[$array_num];
}
} else {
$re_domain = $array_domain[$array_num - 1] . "." . $array_domain[$array_num];
}
return $re_domain;
}

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