Config.php

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<?php
class Zend_Config implements Countable, Iterator
{
    protected $_allowModifications;

    protected $_index;

    protected $_count;

    protected $_data;

    protected $_skipNextIteration;

    protected $_loadedSection;

    protected $_extends = array();

    protected $_loadFileErrorStr = null;

    public function __construct(array $array, $allowModifications = false)
    {
        $this->_allowModifications = (boolean) $allowModifications;
        $this->_loadedSection = null;
        $this->_index = 0;
        $this->_data = array();
        foreach ($array as $key => $value) {
            if (is_array($value)) {
                $this->_data[$key] = new self($value, $this->_allowModifications);
            } else {
                $this->_data[$key] = $value;
            }
        }
        $this->_count = count($this->_data);
    }

    public function get($name, $default = null)
    {
        $result = $default;
        if (array_key_exists($name, $this->_data)) {
            $result = $this->_data[$name];
        }
        return $result;
    }

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

    public function __set($name, $value)
    {
        if ($this->_allowModifications) {
            if (is_array($value)) {
                $this->_data[$name] = new self($value, true);
            } else {
                $this->_data[$name] = $value;
            }
            $this->_count = count($this->_data);
        } else {
            #require_once 'Zend/Config/Exception.php';
            throw new Zend_Config_Exception('Zend_Config is read only');
        }
    }

    public function __clone()
    {
      $array = array();
      foreach ($this->_data as $key => $value) {
          if ($value instanceof Zend_Config) {
              $array[$key] = clone $value;
          } else {
              $array[$key] = $value;
          }
      }
      $this->_data = $array;
    }

    public function toArray()
    {
        $array = array();
        $data = $this->_data;
        foreach ($data as $key => $value) {
            if ($value instanceof Zend_Config) {
                $array[$key] = $value->toArray();
            } else {
                $array[$key] = $value;
            }
        }
        return $array;
    }

    public function __isset($name)
    {
        return isset($this->_data[$name]);
    }

    public function __unset($name)
    {
        if ($this->_allowModifications) {
            unset($this->_data[$name]);
            $this->_count = count($this->_data);
            $this->_skipNextIteration = true;
        } else {
            #require_once 'Zend/Config/Exception.php';
            throw new Zend_Config_Exception('Zend_Config is read only');
        }

    }

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

    public function current()
    {
        $this->_skipNextIteration = false;
        return current($this->_data);
    }

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

    public function next()
    {
        if ($this->_skipNextIteration) {
            $this->_skipNextIteration = false;
            return;
        }
        next($this->_data);
        $this->_index++;
    }

    public function rewind()
    {
        $this->_skipNextIteration = false;
        reset($this->_data);
        $this->_index = 0;
    }

    public function valid()
    {
        return $this->_index < $this->_count;
    }

    public function getSectionName()
    {
        if(is_array($this->_loadedSection) && count($this->_loadedSection) == 1) {
            $this->_loadedSection = $this->_loadedSection[0];
        }
        return $this->_loadedSection;
    }

    public function areAllSectionsLoaded()
    {
        return $this->_loadedSection === null;
    }


    public function merge(Zend_Config $merge)
    {
        foreach($merge as $key => $item) {
            if(array_key_exists($key, $this->_data)) {
                if($item instanceof Zend_Config && $this->$key instanceof Zend_Config) {
                    $this->$key = $this->$key->merge(new Zend_Config($item->toArray(), !$this->readOnly()));
                } else {
                    $this->$key = $item;
                }
            } else {
                if($item instanceof Zend_Config) {
                    $this->$key = new Zend_Config($item->toArray(), !$this->readOnly());
                } else {
                    $this->$key = $item;
                }
            }
        }

        return $this;
    }

    public function setReadOnly()
    {
        $this->_allowModifications = false;
        foreach ($this->_data as $key => $value) {
            if ($value instanceof Zend_Config) {
                $value->setReadOnly();
            }
        }
    }

    public function readOnly()
    {
        return !$this->_allowModifications;
    }

    public function getExtends()
    {
        return $this->_extends;
    }

    public function setExtend($extendingSection, $extendedSection = null)
    {
        if ($extendedSection === null && isset($this->_extends[$extendingSection])) {
            unset($this->_extends[$extendingSection]);
        } else if ($extendedSection !== null) {
            $this->_extends[$extendingSection] = $extendedSection;
        }
    }

    protected function _assertValidExtend($extendingSection, $extendedSection)
    {
        // detect circular section inheritance
        $extendedSectionCurrent = $extendedSection;
        while (array_key_exists($extendedSectionCurrent, $this->_extends)) {
            if ($this->_extends[$extendedSectionCurrent] == $extendingSection) {
                #require_once 'Zend/Config/Exception.php';
                throw new Zend_Config_Exception('Illegal circular inheritance detected');
            }
            $extendedSectionCurrent = $this->_extends[$extendedSectionCurrent];
        }
        // remember that this section extends another section
        $this->_extends[$extendingSection] = $extendedSection;
    }

    public function _loadFileErrorHandler($errno, $errstr, $errfile, $errline)
    {
        if ($this->_loadFileErrorStr === null) {
            $this->_loadFileErrorStr = $errstr;
        } else {
            $this->_loadFileErrorStr .= (PHP_EOL . $errstr);
        }
    }

    protected function _arrayMergeRecursive($firstArray, $secondArray)
    {
        if (is_array($firstArray) && is_array($secondArray)) {
            foreach ($secondArray as $key => $value) {
                if (isset($firstArray[$key])) {
                    $firstArray[$key] = $this->_arrayMergeRecursive($firstArray[$key], $value);
                } else {
                    if($key === 0) {
                        $firstArray= array(0=>$this->_arrayMergeRecursive($firstArray, $value));
                    } else {
                        $firstArray[$key] = $value;
                    }
                }
            }
        } else {
            $firstArray = $secondArray;
        }

        return $firstArray;
    }
}