PHP 全角转半角实现代码_php技巧
/**
* 将一个字串中含有全角的数字字符、字母、空格或'%+-()'字符转换为相应半角字符
* @access public
* @param string $str 待转换字串
* @return string $str 处理后字串
*/
function make_semiangle($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);
}
$str = "0123ABCDFWS\",.?<>{}[]*&^%#@!~()+-|:;";
echo "$str";
echo "
";
$str = preg_replace('/\xa3([\xa1-\xfe])/e', 'chr(ord(\1)-0x80)', $str);
echo $str;
?>
另外为大家分享一个函数
在许多收集用户信息的表单里,期望用户输入的是半角字符,但是无论你如何强调,如何提醒,还是会有粗心的用户提交全角数据,其实,在一些新手眼中,全角和半角根本就没有区别,甚至他们会觉得:我提交的明明是正确的信息,为什么会提示错误呢?
实际上,全角和半角有一一对应关系,而大多数用户并非故意输入错误的信息,所以,我们可以通过程序来避免这种情况的发生,最多,可以在转换后给用户一个确认的机会,这样,或许能够给用户一个更好的体验。
下面介绍一个函数,实现字符 半角 和 全角 之间的互转。
header("Content-type: text/html; charset=utf-8");
// 第一个参数:传入要转换的字符串
// 第二个参数:取0,半角转全角;取1,全角到半角
function SBC_DBC($str, $args2) {
$DBC = Array(
'0' , '1' , '2' , '3' , '4' ,
'5' , '6' , '7' , '8' , '9' ,
'A' , 'B' , 'C' , 'D' , 'E' ,
'F' , 'G' , 'H' , 'I' , 'J' ,
'K' , 'L' , 'M' , 'N' , 'O' ,
'P' , 'Q' , 'R' , 'S' , 'T' ,
'U' , 'V' , 'W' , 'X' , 'Y' ,
'Z' , 'a' , 'b' , 'c' , 'd' ,
'e' , 'f' , 'g' , 'h' , 'i' ,
'j' , 'k' , 'l' , 'm' , 'n' ,
'o' , 'p' , 'q' , 'r' , 's' ,
't' , 'u' , 'v' , 'w' , 'x' ,
'y' , 'z' , '-' , ' ' , ':' ,
'.' , ',' , '/' , '%' , '#' ,
'!' , '@' , '&' , '(' , ')' ,
'<' , '>' , '"' , ''' , '?' ,
'[' , ']' , '{' , '}' , '\' ,
'|' , '+' , '=' , '_' , '^' ,
'¥' , ' ̄' , '`'
);
$SBC = Array( // 半角
'0', '1', '2', '3', '4',
'5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E',
'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y',
'Z', 'a', 'b', 'c', 'd',
'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's',
't', 'u', 'v', 'w', 'x',
'y', 'z', '-', ' ', ':',
'.', ',', '/', '%', '#',
'!', '@', '&', '(', ')',
'', '"', '\'','?',
'[', ']', '{', '}', '\\',
'|', '+', '=', '_', '^',
'$', '~', '`'
);
if ($args2 == 0) {
return str_replace($SBC, $DBC, $str); // 半角到全角
} else if ($args2 == 1) {
return str_replace($DBC, $SBC, $str); // 全角到半角
} else {
return false;
}
}
$str1 = "http://www.jb51.net/ - 脚本之家";
$str2 = "http://JB51.net/ - 脚本之家";
echo "半角 转 全角:
";
echo $str1 . ' -> ' . SBC_DBC($str1, 0);
echo "
全角 转 半角:
";
echo $str2 . ' -> ' . SBC_DBC($str2, 1);
?>

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