PHP in English string intercept, string length

Source: Internet
Author: User

In the development of PHP, because of our country's language environment problems, so we often need to deal with the Chinese. In PHP, we all know that there are special MB_SUBSTR and Mb_strlen functions that can intercept and calculate the length of Chinese, but since these functions are not the core functions of PHP, they are often not open. Of course, if you are using your own server, just open it in php.ini. If the virtual host is used, and the server does not have the function to open this aspect, it is necessary for us to write a point suitable for our national conditions of the function.

Here are some of the functions that are quite handy. But you know, you have to use it in a utf-8 environment.

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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162 header(‘Content-type:text/html;charset=utf-8‘);/*** 可以统计中文字符串长度的函数* @param $str 要计算长度的字符串* @param $type 计算长度类型,0(默认)表示一个中文算一个字符,1表示一个中文算两个字符**/function abslength($str){    if(empty($str)){        return 0;    }    if(function_exists(‘mb_strlen‘)){        return mb_strlen($str,‘utf-8‘);    }    else {        preg_match_all("/./u", $str, $ar);        return count($ar[0]);    }}$str = ‘我们都是中国人啊,ye!‘;$len = abslength($str);var_dump($len);  //return 12$len = abslength($str,‘1‘);echo ‘<br />‘.$len//return 22/*    utf-8编码下截取中文字符串,参数可以参照substr函数    @param $str 要进行截取的字符串    @param $start 要进行截取的开始位置,负数为反向截取    @param $end 要进行截取的长度*/function utf8_substr($str,$start=0) {    if(empty($str)){        return false;    }    if (function_exists(‘mb_substr‘)){        if(func_num_args() >= 3) {            $end = func_get_arg(2);            return mb_substr($str,$start,$end,‘utf-8‘);        }        else {            mb_internal_encoding("UTF-8");            return mb_substr($str,$start);        }           }    else {        $null = "";        preg_match_all("/./u", $str, $ar);        if(func_num_args() >= 3) {            $end = func_get_arg(2);            return join($null, array_slice($ar[0],$start,$end));        }        else {            return join($null, array_slice($ar[0],$start));        }    }}$str2= ‘wo要截取zhongwen‘;echo ‘<br />‘;echo utf8_substr($str2,0,-4); //return wo要截取zhon

Support Gb2312,gbk,utf-8,big5 Chinese interception method

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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 /*  * 中文截取,支持gb2312,gbk,utf-8,big5  * @param string $str 要截取的字串  * @param int $start 截取起始位置  * @param int $length 截取长度  * @param string $charset utf-8|gb2312|gbk|big5 编码  * @param $suffix 是否加尾缀  */ public function csubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)     if(function_exists("mb_substr"))            if(mb_strlen($str, $charset) <= $length) return $str        $slice = mb_substr($str, $start, $length, $charset);        else          $re[‘utf-8‘]   = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/"       $re[‘gb2312‘] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/"        $re[‘gbk‘]          = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/"       $re[‘big5‘]          = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/"        preg_match_all($re[$charset], $str, $match);         if(count($match[0]) <= $length) return $str       $slice = join("",array_slice($match[0], $start, $length));        if($suffix) return $slice."…"   return $slice}

PHP in English string intercept, string length

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