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  • Translation 12.2% Update 2011-11-16 - Revision 24447 - Version ZF 1.11.x

    Capítulo 74. Zend_Uri

    74.1. Zend_Uri

    74.1.1. Overview

    Zend_Uri is a component that aids in manipulating and validating Uniform Resource Identifiers (URIs). Zend_Uri exists primarily to service other components, such as Zend_Http_Client, but is also useful as a standalone utility.

    URIs always begin with a scheme, followed by a colon. The construction of the many different schemes varies significantly. The Zend_Uri class provides a factory that returns a subclass of itself which specializes in each scheme. The subclass will be named Zend_Uri_<scheme>, where <scheme> is the scheme, lowercased with the first letter capitalized. An exception to this rule is HTTPS, which is also handled by Zend_Uri_Http.

    74.1.2. Creating a New URI

    Zend_Uri will build a new URI from scratch if only a scheme is passed to Zend_Uri::factory().

    Exemplo 74.1. Creating a New URI with Zend_Uri::factory()

    // To create a new URI from scratch, pass only the scheme.
    $uri Zend_Uri::factory('http');

    // $uri instanceof Zend_Uri_Http

    To create a new URI from scratch, pass only the scheme to Zend_Uri::factory()[30]. If an unsupported scheme is passed and no scheme-specific class is specified, a Zend_Uri_Exception will be thrown.

    If the scheme or URI passed is supported, Zend_Uri::factory() will return a subclass of itself that specializes in the scheme to be created. Creating a New Custom-Class URI

    Starting from Zend Framework 1.10.5, you can specify a custom class to be used when creating the Zend_Uri instance, as a second parameter to the Zend_Uri::factory() method. This enables you to subclass Zend_Uri and create your own custom URI classes, and instantiate new URI objects based on your own custom classes.

    The 2nd parameter passed to Zend_Uri::factory() must be a string with the name of a class extending Zend_Uri. The class must either be alredy-loaded, or loadable using Zend_Loader::loadClass() - that is, it must follow the Zend Framework class and file naming conventions, and must be in your include_path.

    Exemplo 74.2. Creating a URI using a custom class

    // Create a new 'ftp' URI based on a custom class
    $ftpUri Zend_Uri::factory(

    // $ftpUri is an instance of MyLibrary_Uri_Ftp, which is a subclass of Zend_Uri

    74.1.3. Manipulating an Existing URI

    To manipulate an existing URI, pass the entire URI to Zend_Uri::factory().

    Exemplo 74.3. Manipulating an Existing URI with Zend_Uri::factory()

    // To manipulate an existing URI, pass it in.
    $uri Zend_Uri::factory('');

    // $uri instanceof Zend_Uri_Http

    The URI will be parsed and validated. If it is found to be invalid, a Zend_Uri_Exception will be thrown immediately. Otherwise, Zend_Uri::factory() will return a subclass of itself that specializes in the scheme to be manipulated.

    74.1.4. URI Validation

    The Zend_Uri::check() method can only be used if validation of an existing URI is needed.

    Exemplo 74.4. URI Validation with Zend_Uri::check()

    // Validate whether a given URI is well formed
    $valid Zend_Uri::check('');

    // $valid is TRUE for a valid URI, or FALSE otherwise.

    Zend_Uri::check() returns a boolean, which is more convenient than using Zend_Uri::factory() and catching the exception. Allowing "Unwise" characters in URIs

    By default, Zend_Uri will not accept the following characters: "{", "}", "|", "\", "^", "`". These characters are defined by the RFC as "unwise" and invalid; however, many implementations do accept these characters as valid.

    Zend_Uri can be set to accept these "unwise" characters by setting the 'allow_unwise' option to boolean TRUE using Zend_Uri::setConfig():

    Exemplo 74.5. Allowing special characters in URIs

    // Contains '|' symbol
    // Normally, this would return false:
    $valid Zend_Uri::check('|that');

    // However, you can allow "unwise" characters
    Zend_Uri::setConfig(array('allow_unwise' => true));

    // will return 'true'
    $valid Zend_Uri::check('|that');

    // Reset the 'allow_unwise' value to the default FALSE
    Zend_Uri::setConfig(array('allow_unwise' => false));

    [Nota] Nota

    Zend_Uri::setConfig() sets configuration options globally. It is recommended to reset the 'allow_unwise' option to 'FALSE', like in the example above, unless you are certain you want to always allow unwise characters globally.

    74.1.5. Common Instance Methods

    Every instance of a Zend_Uri subclass (e.g. Zend_Uri_Http) has several instance methods that are useful for working with any kind of URI. Getting the Scheme of the URI

    The scheme of the URI is the part of the URI that precedes the colon. For example, the scheme of is 'http'.

    Exemplo 74.6. Getting the Scheme from a Zend_Uri_* Object

    $uri Zend_Uri::factory('');

    $scheme $uri->getScheme();  // "http"

    The getScheme() instance method returns only the scheme part of the URI object. Getting the Entire URI

    Exemplo 74.7. Getting the Entire URI from a Zend_Uri_* Object

    $uri Zend_Uri::factory('');

    $uri->getUri();  // ""

    The getUri() method returns the string representation of the entire URI. Validating the URI

    Zend_Uri::factory() will always validate any URI passed to it and will not instantiate a new Zend_Uri subclass if the given URI is found to be invalid. However, after the Zend_Uri subclass is instantiated for a new URI or an existing valid one, it is possible that the URI can later become invalid after it is manipulated.

    Exemplo 74.8. Validating a Zend_Uri_* Object

    $uri Zend_Uri::factory('');

    $isValid $uri->valid();  // TRUE

    The valid() instance method provides a means to check that the URI object is still valid.

    [30] At the time of writing, Zend_Uri only provides built-in support for the HTTP and HTTPS schemes.

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