HeaderValue.php

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<?php
final class Zend_Http_Header_HeaderValue
{
    private function __construct()
    {
    }

    public static function filter($value)
    {
        $value  = (string) $value;
        $length = strlen($value);
        $string = '';
        for ($i = 0; $i < $length; $i += 1) {
            $ascii = ord($value[$i]);

            // Non-visible, non-whitespace characters
            // 9 === horizontal tab
            // 32-126, 128-254 === visible
            // 127 === DEL
            // 255 === null byte
            if (($ascii < 32 && $ascii !== 9)
                || $ascii === 127
                || $ascii > 254
            ) {
                continue;
            }

            $string .= $value[$i];
        }

        return $string;
    }

    public static function isValid($value)
    {
        $value  = (string) $value;
        $length = strlen($value);
        for ($i = 0; $i < $length; $i += 1) {
            $ascii = ord($value[$i]);

            // Non-visible, non-whitespace characters
            // 9 === horizontal tab
            // 32-126, 128-254 === visible
            // 127 === DEL
            // 255 === null byte
            if (($ascii < 32 && $ascii !== 9)
                || $ascii === 127
                || $ascii > 254
            ) {
                return false;
            }
        }

        return true;
    }

    public static function assertValid($value)
    {
        if (! self::isValid($value)) {
            #require_once 'Zend/Http/Header/Exception/InvalidArgumentException.php';
            throw new Zend_Http_Header_Exception_InvalidArgumentException('Invalid header value');
        }
    }
}