StringTrim.php

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

class Zend_Filter_StringTrim implements Zend_Filter_Interface
{
    protected $_charList;

    public function __construct($options = null)
    {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        } else if (!is_array($options)) {
            $options          = func_get_args();
            $temp['charlist'] = array_shift($options);
            $options          = $temp;
        }

        if (array_key_exists('charlist', $options)) {
            $this->setCharList($options['charlist']);
        }
    }

    public function getCharList()
    {
        return $this->_charList;
    }

    public function setCharList($charList)
    {
        $this->_charList = $charList;
        return $this;
    }

    public function filter($value)
    {
        if (null === $this->_charList) {
            return $this->_unicodeTrim((string) $value);
        } else {
            return $this->_unicodeTrim((string) $value, $this->_charList);
        }
    }

    protected function _unicodeTrim($value, $charlist = '\\\\s')
    {
        $chars = preg_replace(
            array( '/[\^\-\]\\\]/S', '/\\\{4}/S', '/\//'),
            array( '\\\\\\0', '\\', '\/' ),
            $charlist
        );

        $pattern = '^[' . $chars . ']*|[' . $chars . ']*$';
        return preg_replace("/$pattern/sSD", '', $value);
    }
}