<?php
class Util_Utils_Function {
    /**
     * 获知php版本
     *
     * @param String $version
     * @return bool
     */
    public static function is_php($version = '5.0.0')
    {
        static $_is_php;
        $version = (string) $version;
        if (!isset($_is_php[$version]))
        {
            $_is_php[$version] = (version_compare(PHP_VERSION, $version) < 0) ? FALSE : TRUE;
        }
        return $_is_php[$version];
    }
    /**
     * 压缩转换成十六进制
     *
     * @param String $string
     * @return String
     */
    public static function compress($string)
    {
        return bin2hex(gzdeflate($string, 9));
    }
    
    /**
     * 转成二进制并解压
     *
     * @param String $string
     * @return String
     */
    public static function uncompress($string)
    {
        return gzinflate(pack('H' . strlen($string), $string));
    }
    /**
     * 对URL进行转码(主要防范+)
     *
     * @param String $input
     * @return String
     */
    public static function base64_url_encode($input)
    {
        return strtr(base64_encode($input), '+/=', '-_.');
    }
    
    /**
     * 对URL进行还原
     *
     * @param String $input
     * @return String
     */
    public static function base64_url_decode($input)
    {
        return base64_decode(strtr($input, '-_.', '+/='));
    }
    
    /**
     * 对Str进行转码(主要防范+)
     *
     * @param String $input
     * @return String
     */
    public static function base64_str_encode($input)
    {
        return strtr($input, '+/=', '-_.');
    }
    
    /**
     * 对Str进行还原
     *
     * @param String $input
     * @return String
     */
    public static function base64_str_decode($input)
    {
        return strtr($input, '-_.', '+/=');
    }
    
    /**
     * 判断IP
     * 
     * 使用字符比较
     * 
     * @param String $str
     * @return bool
     */
    public static function is_ip($str)
    {
        if (!strcmp(long2ip(sprintf("%u", ip2long($str))), $str))
            return true;
        else
            return false;
    }
    
    public static function insert($array, $val, $pos = null)
    {
        if (null == $pos)
        {
            $array[] = $val;
            return $array;
        }
        else
        {
            $array2 = array_splice($array, $pos);
            $array[] = $val;
            $array = array_merge($array, $array2);
            return $array;
        }
    }
    
    /**
     * 安全的数组合并，保持字符串和数字索引，字符串请使用array_merger以提高效率
     *
     * @param array $array
     * @return array
     */
    public static function safeMerge($array)
    {
        $num = func_num_args();
        for ($i = 1; $i < $num; $i++)
        {
            $ary = func_get_arg($i);
            foreach ($ary as $k => $v)
            {
                $array[$k] = $v;
            }
        }
        return $array;
    }
    /*
     * 组合数组 
     */
    public static function safeCombine(array $keys, array $values)
    {
        $keys = array_values($keys);
        $values = array_values($values);
        $return = array();
        $counter = count($keys);
        for ($i = 0; $i < $counter; $i++)
        {
            $return[$keys[$i]] = isset($values[$i]) ? $values[$i] : false;
        }
        return $return;
    }
   
    public static function sortLastModified(array $data)
    {
        $lastModified = 0;
        foreach ($data as $url)
        {
            $_lastModified = Q_Utils_Function::headLastModified($url);
            if ($_lastModified > $lastModified)
            {
                $lastModified = $_lastModified;
            }
        }
        return $lastModified;
    }
    
    /**
     * 取GB2312字符串首字母,原理是GBK汉字是按拼音顺序编码的.
     * @param String $input
     * @return String
     **/
    public static function getLetter($input)
    {
        $dict = array(
            'a' => 0xB0C4, 
            'b' => 0xB2C0, 
            'c' => 0xB4ED, 
            'd' => 0xB6E9, 
            'e' => 0xB7A1, 
            'f' => 0xB8C0, 
            'g' => 0xB9FD, 
            'h' => 0xBBF6, 
            'j' => 0xBFA5, 
            'k' => 0xC0AB, 
            'l' => 0xC2E7, 
            'm' => 0xC4C2, 
            'n' => 0xC5B5, 
            'o' => 0xC5BD, 
            'p' => 0xC6D9, 
            'q' => 0xC8BA, 
            'r' => 0xC8F5, 
            's' => 0xCBF9, 
            't' => 0xCDD9, 
            'w' => 0xCEF3, 
            'x' => 0xD188, 
            'y' => 0xD4D0, 
            'z' => 0xD7F9
        );
        $str_1 = substr($input, 0, 1);
        if ($str_1 >= chr(0x81) && $str_1 <= chr(0xfe))
        {
            $num = hexdec(bin2hex(substr($input, 0, 2)));
            foreach ($dict as $k => $v)
            {
                if ($v >= $num)
                {
                    break;
                }
            }
            return $k;
        }
        else
        {
            return $str_1;
        }
    }
    public static  function urlDecode( $input )
    {
        return preg_replace("#\%u([0-9a-f]{4})#ie", "iconv('UCS-2', 'UTF-8//IGNORE', pack('H4', '\\1'))", $input);
    }

}