中文如何转换为bytes[]

$s = "广东";<br />$s = iconv('gbk', 'utf-8', $s);<br />$r = array_map('ord', str_split($s));<br />print_r($r);

Array<br />(<br />    [0] => 229<br />    [1] => 185<br />    [2] => 191<br />    [3] => 228<br />    [4] => 184<br />    [5] => 156<br />)<br /><br />

$s = "广东";<br />$s = iconv('gbk', 'utf-8', $s);<br />$r = unpack('C*', $s);<br />print_r($r);

Array<br />(<br />    [1] => 229<br />    [2] => 185<br />    [3] => 191<br />    [4] => 228<br />    [5] => 184<br />    [6] => 156<br />)<br /><br />

$s = "广东";<br />$s = iconv('gbk', 'utf-8', $s);<br />$r = unpack('c*', $s);<br />print_r($r);

Array<br />(<br />    [1] => -27<br />    [2] => -71<br />    [3] => -65<br />    [4] => -28<br />    [5] => -72<br />    [6] => -100<br />)<br /><br />