How to convert full-width characters to half-width characters in PHP

墨辰丷
Release: 2023-03-30 22:48:01
Original
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本篇文章主要介绍PHP实现全角字符转为半角的方法,感兴趣的朋友参考下,希望对大家有所帮助。

最简单的方法

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

总结:以上就是本篇文的全部内容,希望能对大家的学习有所帮助。

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