SeparatorToCamelCase.php

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<?php
#require_once 'Zend/Filter/Word/Separator/Abstract.php';

class Zend_Filter_Word_SeparatorToCamelCase extends Zend_Filter_Word_Separator_Abstract
{

    public function filter($value)
    {
        // a unicode safe way of converting characters to \x00\x00 notation
        $pregQuotedSeparator = preg_quote($this->_separator, '#');

        if (self::isUnicodeSupportEnabled()) {
            parent::setMatchPattern(array('#('.$pregQuotedSeparator.')(\p{L}{1})#','#(^\p{Ll}{1})#'));
            parent::setReplacement(array('Zend_Filter_Word_SeparatorToCamelCase', '_strtoupperArray'));
        } else {
            parent::setMatchPattern(array('#('.$pregQuotedSeparator.')([A-Za-z]{1})#','#(^[A-Za-z]{1})#'));
            parent::setReplacement(array('Zend_Filter_Word_SeparatorToCamelCase', '_strtoupperArray'));
        }

        return preg_replace_callback($this->_matchPattern, $this->_replacement, $value);
    }

    private static function _strtoupperArray(array $matches)
    {
        if (array_key_exists(2, $matches)) {
            return strtoupper($matches[2]);
        }
        return strtoupper($matches[1]);
    }

}