yiiapi/framework/utils/CPropertyValue.php

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<?php
/**
 * CPropertyValue class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CPropertyValue is a helper class that provides static methods to convert component property values to specific types.
 *
 * CPropertyValue is commonly used in component setter methods to ensure
 * the new property value is of the specific type.
 * For example, a boolean-typed property setter method would be as follows,
 * <pre>
 * public function setPropertyName($value)
 * {
 *     $value=CPropertyValue::ensureBoolean($value);
 *     // $value is now of boolean type
 * }
 * </pre>
 *
 * Properties can be of the following types with specific type conversion rules:
 * <ul>
 * <li>string: a boolean value will be converted to 'true' or 'false'.</li>
 * <li>boolean: string 'true' (case-insensitive) will be converted to true,
 *            string 'false' (case-insensitive) will be converted to false.</li>
 * <li>integer</li>
 * <li>float</li>
 * <li>array: string starting with '(' and ending with ')' will be considered as
 *          as an array expression and will be evaluated. Otherwise, an array
 *          with the value to be ensured is returned.</li>
 * <li>object</li>
 * <li>enum: enumerable type, represented by an array of strings.</li>
 * </ul>
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.utils
 * @since 1.0
 */
class CPropertyValue
{
	/**
	 * Converts a value to boolean type.
	 * Note, string 'true' (case-insensitive) will be converted to true,
	 * string 'false' (case-insensitive) will be converted to false.
	 * If a string represents a non-zero number, it will be treated as true.
	 * @param mixed $value the value to be converted.
	 * @return boolean
	 */
	public static function ensureBoolean($value)
	{
		if (is_string($value))
			return !strcasecmp($value,'true') || $value!=0;
		else
			return (boolean)$value;
	}