PHP实现全角字符转为半角方法汇总

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本文介绍了PHP实现全角字符转为半角方法汇总，希望对您有用。如果有疑问，可以联系我们。

PHP编程最简单的办法

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

PHP编程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)所得的数字便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.

PHP编程在非UTF-8模式下这个函数是可行的,但是UTF-8下这个办法就似乎无效,

PHP编程办法二：

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

PHP编程办法三：

PHP编程
/**
* 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;
}
}

PHP编程办法四：

PHP编程
/**
* 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)
{
$arr = array('０' => '0','ｚ' => 'z','(' => '(',')' => ')','〔' => '[','〕' => ']','【' => '[','】' => ']','〖' => '[','〗' => ']','“' => '[','”' => ']','‘' => '[',''' => ']','｛' => '{','｝' => '}','《' => '<','》' => '>','％' => '%','＋' => '+','―' => '-','－' => '-','～' => '-','：' => ':','.' => '.','、' => ',' => '.','、' => '.','；' => ','?' => '?','!' => '!','…' => '-','‖' => '|','”' => '"',''' => '`','‘' => '`','｜' => '|','〃' => '"','　' => ' ');
return strtr($str,$arr);
}

PHP编程全角与半角之区别(来自中文维基百科)

PHP编程全角,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.

PHP编程传统上,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,也由本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.

PHP编程以上所述便是本文的全部内容了,希望大家能够喜欢.

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PHP实现全角字符转为半角方法汇总

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