php域名处理函数-PHP源码

下面这款个一个是判断输入的域名是不是合法的，然后再把http,https,ftp进行处理，分析再发送

function _scan_url()
{
$req = $this->_url;

$pos = strpos($req, '://');
$this->_protocol = strtolower(substr($req, 0, $pos));

$req = substr($req, $pos+3);
$pos = strpos($req, '/');
if($pos === false)
$pos = strlen($req);
$host = substr($req, 0, $pos);

if(strpos($host, ':') !== false)
{
list($this->_host, $this->_port) = explode(':', $host);
}
else
{
$this->_host = $host;
$this->_port = ($this->_protocol == 'https') ? 443 : 80;
}

$this->_uri = substr($req, $pos);
if($this->_uri == '')
$this->_uri = '/';
}

function cleanDomain($q,$w=0){ //整理域名 $w=1过滤www.前缀 $w=0不过滤
$q = htmlspecialchars(strtolower(trim($q)));
if(substr($q,0,7) == "http://" || substr($q,0,8) == "https://" || substr($q,0,6) == "ftp://"){
$q = str_replace("http:/","",$q);
$q = str_replace("https:/","",$q);
$q = str_replace("ftp:/","",$q);
}
if(substr($q,0,4) == "www." && $w==1) {
$q = str_replace("www.","",$q);
}
$q = trim($q,"/");
return $q;
}