Introducción a Zend Framework

 Aprendiendo Zend Framework


 Referencia de Zend Framework

  • Zend_Gdata
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  • Traducción al 26.9% - Actualizado el 2011-11-16 - Revisión 24249 - Versión ZF 1.11.x

    34.3. Filter Chains

    Often multiple filters should be applied to some value in a particular order. For example, a login form accepts a username that should be only lowercase, alphabetic characters. Zend_Filter provides a simple method by which filters may be chained together. The following code illustrates how to chain together two filters for the submitted username:

    // Create a filter chain and add filters to the chain
    $filterChain = new Zend_Filter();
    $filterChain->addFilter(new Zend_Filter_Alpha())
    addFilter(new Zend_Filter_StringToLower());

    // Filter the username
    $username $filterChain->filter($_POST['username']);

    Filters are run in the order they were added to Zend_Filter. In the above example, the username is first removed of any non-alphabetic characters, and then any uppercase characters are converted to lowercase.

    Any object that implements Zend_Filter_Interface may be used in a filter chain.

    34.3.1. Changing filter chain order

    Since 1.10, the Zend_Filter chain also supports altering the chain by prepending or appending filters. For example, the next piece of code does exactly the same as the other username filter chain example:

    // Create a filter chain and add filters to the chain
    $filterChain = new Zend_Filter();

    // this filter will be appended to the filter chain
    $filterChain->appendFilter(new Zend_Filter_StringToLower());

    // this filter will be prepended at the beginning of the filter chain.
    $filterChain->prependFilter(new Zend_Filter_Alpha());

    // Filter the username
    $username $filterChain->filter($_POST['username']);
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