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Filename : NullAware.php
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<?php
/**
 * Interface for data sources that may contain explicit null values
 *
 * PHP version 5
 *
 * LICENSE:
 *
 * Copyright (c) 2006-2014, Alexey Borzov <avb@php.net>,
 *                          Bertrand Mansion <golgote@mamasam.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *    * The names of the authors may not be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category HTML
 * @package  HTML_QuickForm2
 * @author   Alexey Borzov <avb@php.net>
 * @author   Bertrand Mansion <golgote@mamasam.com>
 * @license  http://opensource.org/licenses/bsd-license.php New BSD License
 * @link     http://pear.php.net/package/HTML_QuickForm2
 */

/**
 * Interface for data sources used by HTML_QuickForm2 objects
 */
require_once 'HTML/QuickForm2/DataSource.php';

/**
 * Interface for data sources that may contain explicit null values
 *
 * getValue() was designed to return null for missing values, unfortunately that
 * led to bugs when data source contained values explicitly set to null,
 * see {@link http://pear.php.net/bugs/bug.php?id=20295}. This interface defines
 * a method that may be used by elements to check whether a value is available,
 * even if that value is null.
 *
 * @category HTML
 * @package  HTML_QuickForm2
 * @author   Alexey Borzov <avb@php.net>
 * @author   Bertrand Mansion <golgote@mamasam.com>
 * @license  http://opensource.org/licenses/bsd-license.php New BSD License
 * @version  Release: 2.0.2
 * @link     http://pear.php.net/package/HTML_QuickForm2
 * @since    Release 2.0.1
 */
interface HTML_QuickForm2_DataSource_NullAware extends HTML_QuickForm2_DataSource
{
    /**
     * Checks whether a value for the element with a given name is available
     *
     * Will return true even if the value is null, similar to array_key_exists()
     *
     * @param string $name Element's name
     *
     * @return bool
     */
    public function hasValue($name);
}
?>