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preg_match_all('/[\x00-\x7F]|[\x80-\xFF]{2}/', '谢1谢a你', $m);//UTF-8是3字节
print_r($m[0]);
<?
$str="谢谢,a1bc23各位大侠帮忙abc123!";
preg_match_all("/(\S)/u",$str,$res);
print_r($res[1]);
/*
Array
(
[0] => 谢
[1] => 谢
[2] => ,
[3] => a
[4] => 1
[5] => b
[6] => c
[7] => 2
[8] => 3
[9] => 各
[10] => 位
[11] => 大
[12] => 侠
[13] => 帮
[14] => 忙
[15] => a
[16] => b
[17] => c
[18] => 1
[19] => 2
[20] => 3
[21] => !
)
*/
?>