Summary of methods to convert full-width characters to half-width characters in PHP, full-width and half-width_PHP tutorial

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Release: 2016-07-13 09:46:54
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PHP实现全角字符转为半角方法汇总,全角半角

最简单的方法

<&#63;php  
$str = "0123ABCDFWS\",.?<>{}[]*&^%#@!~()+-|:;";  
echo "$str";  
echo "<br />";  
$str = preg_replace('/\xa3([\xa1-\xfe])/e', 'chr(ord(\1)-0x80)', $str);  
echo $str;

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这是网上看来的代码,所有的中文标点的第二个字节减去0X80(即128)所得的数字就是半角所得的数字了。而/e模式表达的是:如果设定了此修正符,preg_replace() 在替换字符串中对逆向引用作正常的替换,将其作为 PHP 代码求值,并用其结果来替换所搜索的字符串。

在非UTF-8模式下这个函数是可行的,但是UTF-8下 这个方法就似乎无效,

方法二:

$queue = Array('0' => '0', '1' => '1', '2' => '2', '3' => '3', '4' => '4', '5' => '5', '6' => '6', '7' => '7', '8' => '8', '9' => '9', 
'A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E', 'F' => 'F', 'G' => 'G', 'H' => 'H', 'I' => 'I', 'J' => 'J', 
'K' => 'K', 'L' => 'L', 'M' => 'M', 'N' => 'N', 'O' => 'O', 'P' => 'P', 'Q' => 'Q', 'R' => 'R', 'S' => 'S', 'T' => 'T', 
'U' => 'U', 'V' => 'V', 'W' => 'W', 'X' => 'X', 'Y' => 'Y', 'Z' => 'Z', 'a' => 'a', 'b' => 'b', 'c' => 'c', 'd' => 'd', 
'e' => 'e', 'f' => 'f', 'g' => 'g', 'h' => 'h', 'i' => 'i', 'j' => 'j', 'k' => 'k', 'l' => 'l', 'm' => 'm', 'n' => 'n', 
'o' => 'o', 'p' => 'p', 'q' => 'q', 'r' => 'r', 's' => 's', 't' => 't', 'u' => 'u', 'v' => 'v', 'w' => 'w', 'x' => 'x', 
'y' => 'y', 'z' => 'z');
echo preg_replace_callback("/([\xEF][\xBC][\x90-\x99]|[\xEF][\xBD][\x81-\x9A\xA1-\xBA])/", 'next_fchar', '0');
function next_fchar($matches){
 global $queue;
 return $queue[$matches[1]];
}
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方法三:

/**
* 字符串半角和全角间相互转换
* @param string $str 待转换的字符串
* @param int  $type TODBC:转换为半角;TOSBC,转换为全角
* @return string 返回转换后的字符串
*/
function convertStrType($str, $type) {

    $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', '-', ' ', ':',
      '.', ',', '/', '%', ' #',
      '!', '@', '&', '(', ')',
      '<', '>', '"', '\'','&#63;',
      '[', ']', '{', '}', '\\',
      '|', '+', '=', '_', '^',
      '¥','~', '`'

);
if($type == 'TODBC'){
return str_replace( $sbc, $dbc, $str ); //半角到全角
}elseif($type == 'TOSBC'){
return str_replace( $dbc, $sbc, $str ); //全角到半角
}else{
return $str;
}
}

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方法四:

/**
* 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)
{
$arr = array('0' => '0', '1' => '1', '2' => '2', '3' => '3', '4' => '4',
'5' => '5', '6' => '6', '7' => '7', '8' => '8', '9' => '9',
'A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E',
'F' => 'F', 'G' => 'G', 'H' => 'H', 'I' => 'I', 'J' => 'J',
'K' => 'K', 'L' => 'L', 'M' => 'M', 'N' => 'N', 'O' => 'O',
'P' => 'P', 'Q' => 'Q', 'R' => 'R', 'S' => 'S', 'T' => 'T',
'U' => 'U', 'V' => 'V', 'W' => 'W', 'X' => 'X', 'Y' => 'Y',
'Z' => 'Z', 'a' => 'a', 'b' => 'b', 'c' => 'c', 'd' => 'd',
'e' => 'e', 'f' => 'f', 'g' => 'g', 'h' => 'h', 'i' => 'i',
'j' => 'j', 'k' => 'k', 'l' => 'l', 'm' => 'm', 'n' => 'n',
'o' => 'o', 'p' => 'p', 'q' => 'q', 'r' => 'r', 's' => 's',
't' => 't', 'u' => 'u', 'v' => 'v', 'w' => 'w', 'x' => 'x',
'y' => 'y', 'z' => 'z',
'(' => '(', ')' => ')', '〔' => '[', '〕' => ']', '【' => '[',
'】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']',
'‘' => '[', ''' => ']', '{' => '{', '}' => '}', '《' => '<',
'》' => '>',
'%' => '%', '+' => '+', '—' => '-', '-' => '-', '~' => '-',
':' => ':', '。' => '.', '、' => ',', ',' => '.', '、' => '.',
';' => ',', '?' => '&#63;', '!' => '!', '…' => '-', '‖' => '|',
'”' => '"', ''' => '`', '‘' => '`', '|' => '|', '〃' => '"',
' ' => ' ');
return strtr($str, $arr);
}
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全角与半角之区别(来自中文维基百科)

全角,又称全形、全宽,是电脑字符的一种格式,字面意思是比普通字符(或半角字符)宽的字符。

传统上,英语或拉丁字母语言使用一字节的空间来存储,而汉字、日语等常使用两字节存储,在使用固定宽度文字的地方,为了使字体看起来整齐,英文字母、数字及其他符号,也由原来只占用一个字空间,改为一概占用两个字的空间来显示,并且使用两个字节来存储。

以上所述就是本文的全部内容了,希望大家能够喜欢。

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