LowerCase.php

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<?php
#require_once 'Zend/Filter/StringToLower.php';

class Zend_Filter_File_LowerCase extends Zend_Filter_StringToLower
{
    public function __construct($options = null)
    {
        if (!empty($options)) {
            $this->setEncoding($options);
        }
    }

    public function filter($value)
    {
        if (!file_exists($value)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception("File '$value' not found");
        }

        if (!is_writable($value)) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception("File '$value' is not writable");
        }

        $content = file_get_contents($value);
        if (!$content) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception("Problem while reading file '$value'");
        }

        $content = parent::filter($content);
        $result  = file_put_contents($value, $content);

        if (!$result) {
            #require_once 'Zend/Filter/Exception.php';
            throw new Zend_Filter_Exception("Problem while writing file '$value'");
        }

        return $value;
    }
}