php ascii怎么转unicode

本文操作环境：Windows7系统、PHP7.1版，Dell G3电脑

php ascii怎么转unicode?

php ascii转unicode

代码如下：

class Coder
{
    public static function ascii2unicode($c)
    {
        $len = strlen($c);
        $a = 0;
        $ascill = '';
        while ($a < $len) {
            $ud = 0;
            if (ord($c{$a}) >= 0 && ord($c{$a}) <= 127) {
                $ud = ord($c{$a});
                $a += 1;
            } else if (ord($c{$a}) >= 192 && ord($c{$a}) <= 223) {
                $ud = (ord($c{$a}) - 192) * 64 + (ord($c{$a + 1}) - 128);
                $a += 2;
            } else if (ord($c{$a}) >= 224 && ord($c{$a}) <= 239) {
                $ud = (ord($c{$a}) - 224) * 4096 + (ord($c{$a + 1}) - 128) * 64 + (ord($c{$a + 2}) - 128);
                $a += 3;
            } else if (ord($c{$a}) >= 240 && ord($c{$a}) <= 247) {
                $ud = (ord($c{$a}) - 240) * 262144 + (ord($c{$a + 1}) - 128) * 4096 + (ord($c{$a + 2}) - 128) * 64 + (ord($c{$a + 3}) - 128);
                $a += 4;
            } else if (ord($c{$a}) >= 248 && ord($c{$a}) <= 251) {
                $ud = (ord($c{$a}) - 248) * 16777216 + (ord($c{$a + 1}) - 128) * 262144 + (ord($c{$a + 2}) - 128) * 4096 + (ord($c{$a + 3}) - 128) * 64 + (ord($c{$a + 4}) - 128);
                $a += 5;
            } else if (ord($c{$a}) >= 252 && ord($c{$a}) <= 253) {
                $ud = (ord($c{$a}) - 252) * 1073741824 + (ord($c{$a + 1}) - 128) * 16777216 + (ord($c{$a + 2}) - 128) * 262144 + (ord($c{$a + 3}) - 128) * 4096 + (ord($c{$a + 4}) - 128) * 64 + (ord($c{$a + 5}) - 128);
                $a += 6;
            } else if (ord($c{$a}) >= 254 && ord($c{$a}) <= 255) { //error
                $ud = false;
            }
            $ascill .= "&#$ud;";
        }
        return $ascill;
    }
}
/**
 * 将ascii码转为字符串
 * @param type $str 要解码的字符串
 * @param type $prefix 前缀，默认:&#
 * @return type
 */
function decode($str, $prefix = "&#")
{
    $str = str_replace($prefix, "", $str);
    $a = explode(";", $str);
    foreach ($a as $dec) {
        if ($dec < 128) {
            $utf .= chr($dec);
        } else if ($dec < 2048) {
            $utf .= chr(192 + (($dec - ($dec % 64)) / 64));
            $utf .= chr(128 + ($dec % 64));
        } else {
            $utf .= chr(224 + (($dec - ($dec % 4096)) / 4096));
            $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
            $utf .= chr(128 + ($dec % 64));
        }
    }
    return $utf;
}

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