Json.php

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<?php
#require_once 'Zend/Config.php';

#require_once 'Zend/Json.php';

class Zend_Config_Json extends Zend_Config
{
    const EXTENDS_NAME = "_extends";

    protected $_ignoreConstants = false;

    protected $_skipExtends = false;

    public function __construct($json, $section = null, $options = false)
    {
        if (empty($json)) {
            #require_once 'Zend/Config/Exception.php';
            throw new Zend_Config_Exception('Filename is not set');
        }

        $allowModifications = false;
        if (is_bool($options)) {
            $allowModifications = $options;
        } elseif (is_array($options)) {
            foreach ($options as $key => $value) {
                switch (strtolower($key)) {
                    case 'allow_modifications':
                    case 'allowmodifications':
                        $allowModifications = (bool) $value;
                        break;
                    case 'skip_extends':
                    case 'skipextends':
                        $this->_skipExtends = (bool) $value;
                        break;
                    case 'ignore_constants':
                    case 'ignoreconstants':
                        $this->_ignoreConstants = (bool) $value;
                        break;
                    default:
                        break;
                }
            }
        }

        set_error_handler(array($this, '_loadFileErrorHandler')); // Warnings and errors are suppressed
        if ($json[0] != '{') {
            $json = file_get_contents($json);
        }
        restore_error_handler();

        // Check if there was a error while loading file
        if ($this->_loadFileErrorStr !== null) {
            #require_once 'Zend/Config/Exception.php';
            throw new Zend_Config_Exception($this->_loadFileErrorStr);
        }

        // Replace constants
        if (!$this->_ignoreConstants) {
            $json = $this->_replaceConstants($json);
        }

        // Parse/decode
        try {
            $config = Zend_Json::decode($json);
        } catch (Zend_Json_Exception $e) {
            // decode failed
            #require_once 'Zend/Config/Exception.php';
            throw new Zend_Config_Exception("Error parsing JSON data");
        }

        if ($section === null) {
            $dataArray = array();
            foreach ($config as $sectionName => $sectionData) {
                $dataArray[$sectionName] = $this->_processExtends($config, $sectionName);
            }

            parent::__construct($dataArray, $allowModifications);
        } elseif (is_array($section)) {
            $dataArray = array();
            foreach ($section as $sectionName) {
                if (!isset($config[$sectionName])) {
                    #require_once 'Zend/Config/Exception.php';
                    throw new Zend_Config_Exception(sprintf('Section "%s" cannot be found', $sectionName));
                }

                $dataArray = array_merge($this->_processExtends($config, $sectionName), $dataArray);
            }

            parent::__construct($dataArray, $allowModifications);
        } else {
            if (!isset($config[$section])) {
                #require_once 'Zend/Config/Exception.php';
                throw new Zend_Config_Exception(sprintf('Section "%s" cannot be found', $section));
            }

            $dataArray = $this->_processExtends($config, $section);
            if (!is_array($dataArray)) {
                // Section in the JSON data contains just one top level string
                $dataArray = array($section => $dataArray);
            }

            parent::__construct($dataArray, $allowModifications);
        }

        $this->_loadedSection = $section;
    }

    protected function _processExtends(array $data, $section, array $config = array())
    {
        if (!isset($data[$section])) {
            #require_once 'Zend/Config/Exception.php';
            throw new Zend_Config_Exception(sprintf('Section "%s" cannot be found', $section));
        }

        $thisSection  = $data[$section];

        if (is_array($thisSection) && isset($thisSection[self::EXTENDS_NAME])) {
            if (is_array($thisSection[self::EXTENDS_NAME])) {
                #require_once 'Zend/Config/Exception.php';
                throw new Zend_Config_Exception('Invalid extends clause: must be a string; array received');
            }
            $this->_assertValidExtend($section, $thisSection[self::EXTENDS_NAME]);

            if (!$this->_skipExtends) {
                $config = $this->_processExtends($data, $thisSection[self::EXTENDS_NAME], $config);
            }
            unset($thisSection[self::EXTENDS_NAME]);
        }

        $config = $this->_arrayMergeRecursive($config, $thisSection);

        return $config;
    }

    protected function _replaceConstants($value)
    {
        foreach ($this->_getConstants() as $constant) {
            if (strstr($value, $constant)) {
                // handle backslashes that may represent windows path names for instance
                $replacement = str_replace('\\', '\\\\', constant($constant));
                $value = str_replace($constant, $replacement, $value);
            }
        }
        return $value;
    }

    protected function _getConstants()
    {
        $constants = array_keys(get_defined_constants());
        rsort($constants, SORT_STRING);
        return $constants;
    }
}