utf8字符串半角替换全角的问题

[tsrub]

$fchar = Array('０' => '0', '１' => '1', '２' => '2', '３' => '3', '４' => '4', '５' => '5', '６' => '6', '７' => '7', '８' => '8', '９' => '9',
'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D', 'Ｅ' => 'E', 'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I', 'Ｊ' => 'J',
'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N', 'Ｏ' => 'O', 'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S', 'Ｔ' => 'T',
'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X', 'Ｙ' => 'Y', 'Ｚ' => 'Z', 'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd',
'ｅ' => 'e', 'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i', 'ｊ' => 'j', 'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n',
'ｏ' => 'o', 'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's', 'ｔ' => 't', 'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x',
'ｙ' => 'y', 'ｚ' => 'z');
return preg_replace("/([\xEF][\xBC][\x90-\x99]|[\xEF][\xBD][\x81-\x9A\xA1-\xBA])/", $fchar["\${1}"], $str);
这样会把０１２３ａｂｃ这样的全角字符，替换成$fchar[０]$fchar[１]$fchar[２]，而不是想要的012
请问怎么替换才能成功，谢谢

[PleaseDoTellMeWhy]

模式修正符 /u

[tsrub]

谢谢，加上后，全角字符可以正常转半角了，但是如果原来的字符是半角字符的话，就会变为空

[SysTem128]

<?php
$str = '０１２３ＡｂｃＸ this is a test';

function getFchar($fKey = null)
{
	$fchar   =   Array(
	'０'   =>   '0',
	'１'   =>   '1',
	'２'   =>   '2',
	'３'   =>   '3',
	'４'   =>   '4',
	'５'   =>   '5',
	'６'   =>   '6',
	'７'   =>   '7',
	'８'   =>   '8',
	'９'   =>   '9',
	'Ａ'   =>   'A',
	'Ｂ'   =>   'B',
	'Ｃ'   =>   'C',
	'Ｄ'   =>   'D',
	'Ｅ'   =>   'E',
	'Ｆ'   =>   'F',
	'Ｇ'   =>   'G',
	'Ｈ'   =>   'H',
	'Ｉ'   =>   'I',
	'Ｊ'   =>   'J',
	'Ｋ'   =>   'K',
	'Ｌ'   =>   'L',
	'Ｍ'   =>   'M',
	'Ｎ'   =>   'N',
	'Ｏ'   =>   'O',
	'Ｐ'   =>   'P',
	'Ｑ'   =>   'Q',
	'Ｒ'   =>   'R',
	'Ｓ'   =>   'S',
	'Ｔ'   =>   'T',
	'Ｕ'   =>   'U',
	'Ｖ'   =>   'V',
	'Ｗ'   =>   'W',
	'Ｘ'   =>   'X',
	'Ｙ'   =>   'Y',
	'Ｚ'   =>   'Z',
	'ａ'   =>   'a',
	'ｂ'   =>   'b',
	'ｃ'   =>   'c',
	'ｄ'   =>   'd',
	'ｅ'   =>   'e',
	'ｆ'   =>   'f',
	'ｇ'   =>   'g',
	'ｈ'   =>   'h',
	'ｉ'   =>   'i',
	'ｊ'   =>   'j',
	'ｋ'   =>   'k',
	'ｌ'   =>   'l',
	'ｍ'   =>   'm',
	'ｎ'   =>   'n',
	'ｏ'   =>   'o',
	'ｐ'   =>   'p',
	'ｑ'   =>   'q',
	'ｒ'   =>   'r',
	'ｓ'   =>   's',
	'ｔ'   =>   't',
	'ｕ'   =>   'u',
	'ｖ'   =>   'v',
	'ｗ'   =>   'w',
	'ｘ'   =>   'x',
	'ｙ'   =>   'y',
	'ｚ'   =>   'z'
	);
	return isset($fchar[$fKey])?$fchar[$fKey]:$fchar;
}
function next_fchar($matches)
{
	return getFchar($matches[1]);
}
echo  preg_replace_callback(
"/([\xa3\xb0-\xb9|\xa3\xc1-\xFa]{2})/U"
,'next_fchar',
$str); 
?>

[SysTem128]

实际上把最后一位减去80(128)就行了,这过程还包含一次判断,放在next_fchar函数里即可.

[tsrub]

是utf8编码的，上面的代码在utf8下面不成功

[tsrub]

preg_replace_callback("/([\xEF][\xBC][\x90-\x99]|[\xEF][\xBD][\x81-\x9A\xA1-\xBA])/", 'next_fchar', $str);
function next_fchar($matches){
global $queue;
return $queue[$matches[1]];
}
搞定，收工，多谢上面2位