市面上很多评论系统,但是因为某种原因公司没去使用,评论系统使用php开发.垃圾评论中各种符号,各种全角数字或者字符，为了便于过滤，这边使用如下php程序将字符从全角转为半角用户后续的过滤 PHP字符全角转半角字符

function make_semiangle($str)
{
$arr = array('０' => '0', '１' => '1', '２' => '2', '３' => '3', '４' => '4',
'５' => '5', '６' => '6', '７' => '7', '８' => '8', '９' => '9',
'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D', 'Ｅ' => 'E',
'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I', 'Ｊ' => 'J',
'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N', 'Ｏ' => 'O',
'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S', 'Ｔ' => 'T',
'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X', 'Ｙ' => 'Y',
'Ｚ' => 'Z', 'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd',
'ｅ' => 'e', 'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i',
'ｊ' => 'j', 'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n',
'ｏ' => 'o', 'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's',
'ｔ' => 't', 'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x',
'ｙ' => 'y', 'ｚ' => 'z',
'（' => '(', '）' => ')', '〔' => '[', '〕' => ']', '【' => '[',
'】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']',
'‘' => '[', '’' => ']', '｛' => '{', '｝' => '}', '《' => '<',
'》' => '>',
'％' => '%', '＋' => '+', '—' => '-', '－' => '-', '～' => '-',
'：' => ':', '。' => '.', '、' => ',', '，' => '.', '、' => '.',
'；' => ',', '？' => '?', '！' => '!', '…' => '-', '‖' => '|',
'”' => '"', '’' => '`', '‘' => '`', '｜' => '|', '〃' => '"',
'　' => ' ','＄'=>'$','＠'=>'@','＃'=>'#','＾'=>'^','＆'=>'&','＊'=>'*',
'＂'=>'"');return strtr($str, $arr);
}

来个实例,将全角转为半角

$oldWords="！！ｑｑ３４３８２４７８９！";
$newWords=make_semiangle("！！ｑｑ３４３８２４７８９！");
echo "oldWords:".$oldWords;
echo "</br>newWords:".$newWords;

在浏览器中输入测试地址；http://test.ttlsa.com/html/1771.php.得到如下结果： oldWords:！！ｑｑ３４３８２４７８９！ newWords:!!qq343824789! 如下是我代码截图： [caption id="attachment_1774" align="aligncenter" width="635"] php将字符从全角转到半角的结果截图[/caption] [caption id="attachment_1775" align="aligncenter" width="512"] php将字符从全角转到半角的结果截图[/caption] 转载请注明出处： 如何使用php将字符从全角转为半角 http://www.ttlsa.com/html/1771.html