/**
* 验证域名是否合法
* @param string $domain
* @return bool
*/
function verify_domain(string $domain): bool
{
$res = "/^(?=^.{3,255}$)(http(s)?:\/\/)(www\.)?[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+(:\d+)*(\/\w+\.\w+)*$/";
if (preg_match($res, $domain))
return true;
else
return false;
}测试
var_dump(verify_domain('http://code.cent123.com/')); //bool(false)
var_dump(verify_domain('http://code.cent123.com')); //bool(true)
var_dump(verify_domain('http://www.code.cent123.com')); //bool(true)
var_dump(verify_domain('http://code.cent123.com/view/1')); //bool(false)
var_dump(verify_domain('code.cent123.com')); //bool(false)
var_dump(verify_domain('code.cent123.com')); //bool(false)
