PHP提取中文首字母

从别人程序中扒拉出来的提取中文首字母的php代码不是原创。Dzender的代码学习用

<?     
function pykey( $py_key)     
{     
    $pinyin = 65536 + pys($py_key);     
    if ( 45217 <= $pinyin && $pinyin <= 45252 )     
    {     
        $zimu = "A";     
        return $zimu;     
    }     
    if ( 45253 <= $pinyin && $pinyin <= 45760 )     
    {     
        $zimu = "B";     
        return $zimu;     
    }     
    if ( 45761 <= $pinyin && $pinyin <= 46317 )     
    {     
        $zimu = "C";     
        return $zimu;     
    }     
    if ( 46318 <= $pinyin && $pinyin <= 46825 )     
    {     
        $zimu = "D";     
        return $zimu;     
    }     
    if ( 46826 <= $pinyin && $pinyin <= 47009 )     
    {     
        $zimu = "E";     
        return $zimu;     
    }     
    if ( 47010 <= $pinyin && $pinyin <= 47296 )     
    {     
        $zimu = "F";     
        return $zimu;     
    }     
    if ( 47297 <= $pinyin && $pinyin <= 47613 )     
    {     
        $zimu = "G";     
        return $zimu;     
    }     
    if ( 47614 <= $pinyin && $pinyin <= 48118 )     
    {     
        $zimu = "H";     
        return $zimu;     
    }     
    if ( 48119 <= $pinyin && $pinyin <= 49061 )     
    {     
        $zimu = "J";     
        return $zimu;     
    }     
    if ( 49062 <= $pinyin && $pinyin <= 49323 )     
    {     
        $zimu = "K";     
        return $zimu;     
    }     
    if ( 49324 <= $pinyin && $pinyin <= 49895 )     
    {     
        $zimu = "L";     
        return $zimu;     
    }     
    if ( 49896 <= $pinyin && $pinyin <= 50370 )     
    {     
        $zimu = "M";     
        return $zimu;     
    }     
    if ( 50371 <= $pinyin && $pinyin <= 50613 )     
    {     
        $zimu = "N";     
        return $zimu;     
    }     
    if ( 50614 <= $pinyin && $pinyin <= 50621 )     
    {     
        $zimu = "O";     
        return $zimu;     
    }     
    if ( 50622 <= $pinyin && $pinyin <= 50905 )     
    {     
        $zimu = "P";     
        return $zimu;     
    }     
    if ( 50906 <= $pinyin && $pinyin <= 51386 )     
    {     
        $zimu = "Q";     
        return $zimu;     
    }     
    if ( 51387 <= $pinyin && $pinyin <= 51445 )     
    {     
        $zimu = "R";     
        return $zimu;     
    }     
    if ( 51446 <= $pinyin && $pinyin <= 52217 )     
    {     
        $zimu = "S";     
        return $zimu;     
    }     
    if ( 52218 <= $pinyin && $pinyin <= 52697 )     
    {     
        $zimu = "T";     
        return $zimu;     
    }     
    if ( 52698 <= $pinyin && $pinyin <= 52979 )     
    {     
        $zimu = "W";     
        return $zimu;     
    }     
    if ( 52980 <= $pinyin && $pinyin <= 53640 )     
    {     
        $zimu = "X";     
        return $zimu;     
    }     
    if ( 53689 <= $pinyin && $pinyin <= 54480 )     
    {     
        $zimu = "Y";     
        return $zimu;     
    }     
    if ( 54481 <= $pinyin && $pinyin <= 62289 )     
    {     
        $zimu = "Z";     
        return $zimu;     
    }     
    $zimu = $py_key;     
    return $zimu;     
}     
function pys( $pysa )     
{     
    $pyi = "";     
    $i= 0;     
    for ( ; $i < strlen( $pysa ); $i++)     
    {     
        $_obfuscate_8w= ord( substr( $pysa,$i,1) );     
        if ( 160 < $_obfuscate_8w)     
        {     
            $_obfuscate_Bw = ord( substr( $pysa, $i++, 1 ) );     
            $_obfuscate_8w = $_obfuscate_8w * 256 + $_obfuscate_Bw - 65536;     
        }     
        $pyi.= $_obfuscate_8w;     
    }     
    return $pyi;     
}     
$letter = pykey("中华人民共和国");     
echo $letter;     
?>