Json.php

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

#require_once 'Zend/Config/Json.php';

class Zend_Config_Writer_Json extends Zend_Config_Writer_FileAbstract
{
    protected $_prettyPrint = false;

    public function prettyPrint()
    {
        return $this->_prettyPrint;
    }

    public function setPrettyPrint($flag)
    {
        $this->_prettyPrint = (bool) $flag;
        return $this;
    }

    public function render()
    {
        $data        = $this->_config->toArray();
        $sectionName = $this->_config->getSectionName();
        $extends     = $this->_config->getExtends();

        if (is_string($sectionName)) {
            $data = array($sectionName => $data);
        }

        foreach ($extends as $section => $parentSection) {
            $data[$section][Zend_Config_Json::EXTENDS_NAME] = $parentSection;
        }

        // Ensure that each "extends" section actually exists
        foreach ($data as $section => $sectionData) {
            if (is_array($sectionData) && isset($sectionData[Zend_Config_Json::EXTENDS_NAME])) {
                $sectionExtends = $sectionData[Zend_Config_Json::EXTENDS_NAME];
                if (!isset($data[$sectionExtends])) {
                    // Remove "extends" declaration if section does not exist
                    unset($data[$section][Zend_Config_Json::EXTENDS_NAME]);
                }
            }
        }

        $out = Zend_Json::encode($data);
        if ($this->prettyPrint()) {
             $out = Zend_Json::prettyPrint($out);
        }
        return $out;
    }
}