The Host

The library provides a Host class to ease host creation and manipulation. This URI component object exposes the package common API, but also provide specific methods to work with the URI host component.

If the modifications do not change the current object, it is returned as is, otherwise, a new modified object is returned.

If the submitted value is not valid a League\Uri\Exceptions\SyntaxError exception is thrown.

Creating a new object using the default constructor

<?php
public Host::__construct($content = null): void

submitted string is normalized to be RFC3986 compliant.

Basic properties and methods

The following methods will always be available independently of the Host type. They define the host main features and properties.

public Host::getIp(): string
public Host::getIpVersion(): ?string
public Host::isIp(): bool
public Host::isDomain(): bool
public Host::toAscii(): ?string
public Host::toUnicode(): ?string

Hosts can be:

Host represented by a registered name

If you don’t have a IP then you are dealing with a registered name. A registered name can be a domain name subset if it follows RFC1123 but it is not a requirement as stated in RFC3986

(…) URI producers should use names that conform to the DNS syntax, even when use of DNS is not immediately apparent, and should limit these names to no more than 255 characters in length.

public Host::isDomain(): bool

To determine if a host is a domain name and not a general registered name or an IP address, you just need to use the Host::isDomain method.

$domain = new Host('www.example.co.uk');
$domain->isDomain();  //return true

$reg_name = new Host('...test.com');
$reg_name->isDomain();  //return false

Normalization

Whenever you create a new host your submitted data is normalized using non destructive operations:

$host = new Host('ShOp.ExAmPle.COM');
echo $host; //display 'shop.example.com'

$host = new Host('BéBé.be');
echo $host; //display 'xn--bb-bjab.be'

The last example depends on the presence of the ext-intl extension. Otherwise the code will trigger a IdnSupportMissing exception

At any given time you can access the ascii or unicode Host representation using the two (2) following methods:

$host = new Host('BéBé.be');
echo $host; //display 'xn--bb-bjab.be'
echo $host->toUnicode();  //displays bébé.be
echo $host->toAscii();  //displays 'xn--bb-bjab.be'

Both methods depends on the presence of the ext-intl extension. Otherwise the code will trigger a IdnSupportMissing exception

Host represented by an IP

public static Host::createFromIp(string $ip, string $version = '', Math $math = null): self
public Host::isIpv4(): bool
public Host::isIpv6(): bool
public Host::isIpFuture(): bool
public Host::hasZoneIdentifier(): bool
public Host::withoutZoneIdentifier(): self

Host::createFromIp

This method allows creating an Host object from an IP.

$ipv4 = Host::createFromIp('127.0.0.1');
echo $ipv4; //display '127.0.0.1'

$ipv6 = Host::createFromIp('::1');
echo $ipv6; //display '[::1]'

Host::createFromIp('uri.thephpleague.com');
//throws League\Uri\Exceptions\SyntaxError

The method can also infer the IPv4 from its hexadecimal or octal representation.

use League\Uri\Components\Host;
use League\Uri\Maths\GMPMath;

$ipv4 = Host::createFromIp('999999999', '', new GMPMath());
echo $ipv4; //display '59.154.201.255'

This normalization works using:

You can skip providing such object if:

A RuntimeException will be trigger if no League\Uri\Maths\Math is provided or can not be detected

.

$ipv4 = Host::createFromIp('999999999');
echo $ipv4; //display '59.154.201.255'
//will work on supported platform 

This normalization is destructive and thus is never apply internally on a instantiated Host object.

IPv4 or IPv6

There are two (2) types of host:

To determine what type of host you are dealing with the Host class provides the isIp method:

$host = new Host('example.com');
$host->isIp(); //return false;
$ip_host = $host->withContent('127.0.0.1');
$ip_host->isIp(); //return true;

Knowing that you are dealing with an IP is good, knowing its version is better.

$ipv6 = Host::createFromIp('::1');
$ipv6->isIp();       //return true
$ipv6->isIpv4();     //return false
$ipv6->isIpv6();     //return true
$ipv6->isIpFuture(); //return false
$ipv6->getIpVersion(); //return '6'

$ipv4 = new Host('127.0.0.1');
$ipv4->isIp();       //return true
$ipv4->isIpv4();     //return true
$ipv4->isIpv6();     //return false
$ipv4->isIpFuture(); //return false
$ipv4->getIpVersion(); //return '4'

$ipfuture = new Host('v32.1.2.3.4');
$ipfuture->isIp();       //return true
$ipfuture->isIpv4();     //return false
$ipfuture->isIpv6();     //return false
$ipfuture->isIpFuture(); //return true
$ipfuture->getIpVersion(); //return '32'

$domain = new Host('thephpleague.com'):
$domain->isIp();       //return false
$domain->isIpv4();     //return false
$domain->isIpv6();     //return false
$domain->isIpFuture(); //return false
$domain->getIpVersion(); //return null

Zone Identifier

Detecting the presence of the Zone Identifier

The object can also detect if the IPv6 has a zone identifier or not. This can be handy if you want to know if you need to remove it or not for security reason.

$ipv6 = new Host('[Fe80::4432:34d6:e6e6:b122%eth0-1]');
$ipv6->hasZoneIdentifier(); //return true

$ipv4 = new Host('127.0.0.1');
$ipv4->hasZoneIdentifier(); //return false

Removing the Zone Identifier

According to RFC6874:

You must remove any ZoneID attached to an outgoing URI, as it has only local significance at the sending host.

To fullfill this requirement, the Host::withoutZoneIdentifier method is provided. The method takes not parameter and return a new host instance without its zone identifier. If the host has not zone identifier, the current instance is returned unchanged.

$host    = new Host('[fe80::1%25eth0-1]');
$newHost = $host->withoutZoneIdentifier();
echo $newHost; //displays '[fe80::1]';

Getting the IP string representation

You can retrieve the IP string representation from the Host object using the getIp method. If the Host is not an IP null will be returned instead.

$host = new Host('[fe80::1%25eth0-1]');
$host->getIp(); //returns 'fe80::1%eth0-1'

$newHost = $host->withContent('uri.thephpleague.com');
$newHost->getIp();        //returns null
$newHost->getIpVersion(); //returns null