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Editing: Set.php

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<?php
/**
 * Slim - a micro PHP 5 framework
 *
 * @author      Josh Lockhart <info@slimframework.com>
 * @copyright   2011 Josh Lockhart
 * @link        http://www.slimframework.com
 * @license     http://www.slimframework.com/license
 * @version     2.4.2
 * @package     Slim
 *
 * MIT LICENSE
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
namespace Slim\Helper;

class Set implements \ArrayAccess, \Countable, \IteratorAggregate
{
    /**
     * Key-value array of arbitrary data
     * @var array
     */
    protected $data = array();

/**
     * Constructor
     * @param array $items Pre-populate set with this key-value array
     */
    public function __construct($items = array())
    {
        $this->replace($items);
    }

/**
     * Normalize data key
     *
     * Used to transform data key into the necessary
     * key format for this set. Used in subclasses
     * like \Slim\Http\Headers.
     *
     * @param  string $key The data key
     * @return mixed       The transformed/normalized data key
     */
    protected function normalizeKey($key)
    {
        return $key;
    }

/**
     * Set data key to value
     * @param string $key   The data key
     * @param mixed  $value The data value
     */
    public function set($key, $value)
    {
        $this->data[$this->normalizeKey($key)] = $value;
    }

/**
     * Get data value with key
     * @param  string $key     The data key
     * @param  mixed  $default The value to return if data key does not exist
     * @return mixed           The data value, or the default value
     */
    public function get($key, $default = null)
    {
        if ($this->has($key)) {
            $isInvokable = is_object($this->data[$this->normalizeKey($key)]) && method_exists($this->data[$this->normalizeKey($key)], '__invoke');

return $isInvokable ? $this->data[$this->normalizeKey($key)]($this) : $this->data[$this->normalizeKey($key)];
        }

return $default;
    }

/**
     * Add data to set
     * @param array $items Key-value array of data to append to this set
     */
    public function replace($items)
    {
        foreach ($items as $key => $value) {
            $this->set($key, $value); // Ensure keys are normalized
        }
    }

/**
     * Fetch set data
     * @return array This set's key-value data array
     */
    public function all()
    {
        return $this->data;
    }

/**
     * Fetch set data keys
     * @return array This set's key-value data array keys
     */
    public function keys()
    {
        return array_keys($this->data);
    }

/**
     * Does this set contain a key?
     * @param  string  $key The data key
     * @return boolean
     */
    public function has($key)
    {
        return array_key_exists($this->normalizeKey($key), $this->data);
    }

/**
     * Remove value with key from this set
     * @param  string $key The data key
     */
    public function remove($key)
    {
        unset($this->data[$this->normalizeKey($key)]);
    }

/**
     * Property Overloading
     */

public function __get($key)
    {
        return $this->get($key);
    }

public function __set($key, $value)
    {
        $this->set($key, $value);
    }

public function __isset($key)
    {
        return $this->has($key);
    }

public function __unset($key)
    {
        return $this->remove($key);
    }

/**
     * Clear all values
     */
    public function clear()
    {
        $this->data = array();
    }

/**
     * Array Access
     */

public function offsetExists($offset)
    {
        return $this->has($offset);
    }

public function offsetGet($offset)
    {
        return $this->get($offset);
    }

public function offsetSet($offset, $value)
    {
        $this->set($offset, $value);
    }

public function offsetUnset($offset)
    {
        $this->remove($offset);
    }

/**
     * Countable
     */

public function count()
    {
        return count($this->data);
    }

/**
     * IteratorAggregate
     */

public function getIterator()
    {
        return new \ArrayIterator($this->data);
    }

/**
     * Ensure a value or object will remain globally unique
     * @param  string  $key   The value or object name
     * @param  Closure        The closure that defines the object
     * @return mixed
     */
    public function singleton($key, $value)
    {
        $this->set($key, function ($c) use ($value) {
            static $object;

if (null === $object) {
                $object = $value($c);
            }

return $object;
        });
    }

/**
     * Protect closure from being directly invoked
     * @param  Closure $callable A closure to keep from being invoked and evaluated
     * @return Closure
     */
    public function protect(\Closure $callable)
    {
        return function () use ($callable) {
            return $callable;
        };
    }
}

Editing: Set.php

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