$v)$tmp[$k] = $charset[$v];//返回换码后的串return join('',$tmp);}/** utf-8到gb2312 **/
function utf82gb($text, &$charset) {$p = /[xf0-xf7][x80-xbf]{3}|[xe0-xef][x80-xbf]{2}|[xc2-xdf][x80-xbf]|[x01-x7f]+/;preg_match_all($p,$text,$r);$utf8 = array_flip($charset);foreach($r[0] as $k=>$v)if(isset($utf8[$v]))$r[0][$k] = $utf8[$v];return join('',$r[0]);}//测试
$s = gb2utf8('这是对照表的测试', $charset);echo utf82gb($s, $charset);?>
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