Value object representing a URI.

This interface is meant to represent URIs according to RFC 3986 and to
provide methods for most common operations. Additional functionality for
working with URIs can be provided on top of the interface or externally.
Its primary use is for HTTP requests, but may also be used in other
contexts.

Instances of this interface are considered immutable; all methods that
might change state MUST be implemented such that they retain the internal
state of the current instance and return an instance that contains the
changed state.

Typically the Host header will be also be present in the request message.
For server-side requests, the scheme will typically be discoverable in the
server parameters.

AbstractInterface
Methods
public abstract __toString()
 

Return the string representation as a URI reference.

Depending on which components of the URI are present, the resulting
string is either a full URI or relative reference according to RFC 3986,
Section 4.1. The method concatenates the various components of the URI,
using the appropriate delimiters:

  • If a scheme is present, it MUST be suffixed by ":".
  • If an authority is present, it MUST be prefixed by "//".
  • The path can be concatenated without delimiters. But there are two
    cases where the path has to be adjusted to make the URI reference
    valid as PHP does not allow to throw an exception in __toString():
    • If the path is rootless and an authority is present, the path MUST
      be prefixed by "/".
    • If the path is starting with more than one "/" and no authority is
      present, the starting slashes MUST be reduced to one.
  • If a query is present, it MUST be prefixed by "?".
  • If a fragment is present, it MUST be prefixed by "#".
  • see http://tools.ietf.org/html/rfc3986#section-4.1
  • return string
public abstract getAuthority()
 

Retrieve the authority component of the URI.

If no authority information is present, this method MUST return an empty
string.

The authority syntax of the URI is:

[user-info@]host[:port]

If the port component is not set or is the standard port for the current
scheme, it SHOULD NOT be included.

  • see https://tools.ietf.org/html/rfc3986#section-3.2
  • return string The URI authority, in "[user-info@]host[:port]" format.
public abstract getFragment()
 

Retrieve the fragment component of the URI.

If no fragment is present, this method MUST return an empty string.

The leading "#" character is not part of the fragment and MUST NOT be
added.

The value returned MUST be percent-encoded, but MUST NOT double-encode
any characters. To determine what characters to encode, please refer to
RFC 3986, Sections 2 and 3.5.

  • see https://tools.ietf.org/html/rfc3986#section-2
  • see https://tools.ietf.org/html/rfc3986#section-3.5
  • return string The URI fragment.
public abstract getHost()
 

Retrieve the host component of the URI.

If no host is present, this method MUST return an empty string.

The value returned MUST be normalized to lowercase, per RFC 3986
Section 3.2.2.

  • see http://tools.ietf.org/html/rfc3986#section-3.2.2
  • return string The URI host.
public abstract getPath()
 

Retrieve the path component of the URI.

The path can either be empty or absolute (starting with a slash) or
rootless (not starting with a slash). Implementations MUST support all
three syntaxes.

Normally, the empty path "" and absolute path "/" are considered equal as
defined in RFC 7230 Section 2.7.3. But this method MUST NOT automatically
do this normalization because in contexts with a trimmed base path, e.g.
the front controller, this difference becomes significant. It's the task
of the user to handle both "" and "/".

The value returned MUST be percent-encoded, but MUST NOT double-encode
any characters. To determine what characters to encode, please refer to
RFC 3986, Sections 2 and 3.3.

As an example, if the value should include a slash ("/") not intended as
delimiter between path segments, that value MUST be passed in encoded
form (e.g., "%2F") to the instance.

  • see https://tools.ietf.org/html/rfc3986#section-2
  • see https://tools.ietf.org/html/rfc3986#section-3.3
  • return string The URI path.
public abstract getPort()
 

Retrieve the port component of the URI.

If a port is present, and it is non-standard for the current scheme,
this method MUST return it as an integer. If the port is the standard port
used with the current scheme, this method SHOULD return null.

If no port is present, and no scheme is present, this method MUST return
a null value.

If no port is present, but a scheme is present, this method MAY return
the standard port for that scheme, but SHOULD return null.

  • return null|int The URI port.
public abstract getQuery()
 

Retrieve the query string of the URI.

If no query string is present, this method MUST return an empty string.

The leading "?" character is not part of the query and MUST NOT be
added.

The value returned MUST be percent-encoded, but MUST NOT double-encode
any characters. To determine what characters to encode, please refer to
RFC 3986, Sections 2 and 3.4.

As an example, if a value in a key/value pair of the query string should
include an ampersand ("&") not intended as a delimiter between values,
that value MUST be passed in encoded form (e.g., "%26") to the instance.

  • see https://tools.ietf.org/html/rfc3986#section-2
  • see https://tools.ietf.org/html/rfc3986#section-3.4
  • return string The URI query string.
public abstract getScheme()
 

Retrieve the scheme component of the URI.

If no scheme is present, this method MUST return an empty string.

The value returned MUST be normalized to lowercase, per RFC 3986
Section 3.1.

The trailing ":" character is not part of the scheme and MUST NOT be
added.

  • see https://tools.ietf.org/html/rfc3986#section-3.1
  • return string The URI scheme.
public abstract getUserInfo()
 

Retrieve the user information component of the URI.

If no user information is present, this method MUST return an empty
string.

If a user is present in the URI, this will return that value;
additionally, if the password is also present, it will be appended to the
user value, with a colon (":") separating the values.

The trailing "@" character is not part of the user information and MUST
NOT be added.

  • return string The URI user information, in "username[:password]" format.
public abstract withFragment( $fragment)
 

Return an instance with the specified URI fragment.

This method MUST retain the state of the current instance, and return
an instance that contains the specified URI fragment.

Users can provide both encoded and decoded fragment characters.
Implementations ensure the correct encoding as outlined in getFragment().

An empty fragment value is equivalent to removing the fragment.

  • return static A new instance with the specified fragment.
public abstract withHost( $host)
 

Return an instance with the specified host.

This method MUST retain the state of the current instance, and return
an instance that contains the specified host.

An empty host value is equivalent to removing the host.

  • return static A new instance with the specified host.
  • throws InvalidArgumentException for invalid hostnames.
public abstract withPath( $path)
 

Return an instance with the specified path.

This method MUST retain the state of the current instance, and return
an instance that contains the specified path.

The path can either be empty or absolute (starting with a slash) or
rootless (not starting with a slash). Implementations MUST support all
three syntaxes.

If the path is intended to be domain-relative rather than path relative then
it must begin with a slash ("/"). Paths not starting with a slash ("/")
are assumed to be relative to some base path known to the application or
consumer.

Users can provide both encoded and decoded path characters.
Implementations ensure the correct encoding as outlined in getPath().

  • return static A new instance with the specified path.
  • throws InvalidArgumentException for invalid paths.
public abstract withPort( $port)
 

Return an instance with the specified port.

This method MUST retain the state of the current instance, and return
an instance that contains the specified port.

Implementations MUST raise an exception for ports outside the
established TCP and UDP port ranges.

A null value provided for the port is equivalent to removing the port
information.

  • return static A new instance with the specified port.
  • throws InvalidArgumentException for invalid ports.
public abstract withQuery( $query)
 

Return an instance with the specified query string.

This method MUST retain the state of the current instance, and return
an instance that contains the specified query string.

Users can provide both encoded and decoded query characters.
Implementations ensure the correct encoding as outlined in getQuery().

An empty query string value is equivalent to removing the query string.

  • return static A new instance with the specified query string.
  • throws InvalidArgumentException for invalid query strings.
public abstract withScheme( $scheme)
 

Return an instance with the specified scheme.

This method MUST retain the state of the current instance, and return
an instance that contains the specified scheme.

Implementations MUST support the schemes "http" and "https" case
insensitively, and MAY accommodate other schemes if required.

An empty scheme is equivalent to removing the scheme.

  • return static A new instance with the specified scheme.
  • throws InvalidArgumentException for invalid or unsupported schemes.
public abstract withUserInfo( $user, $password = NULL)
 

Return an instance with the specified user information.

This method MUST retain the state of the current instance, and return
an instance that contains the specified user information.

Password is optional, but the user information MUST include the
user; an empty string for the user is equivalent to removing user
information.

  • return static A new instance with the specified user information.
© 2020 Bruce Wells
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