Home > Article > Backend Development > Summary of methods for intercepting Chinese characters and preventing garbled characters in PHP
Directly using the PHP function substr to intercept Chinese characters may cause garbled characters. The main reason is that substr may forcibly "saw" a Chinese character in half. So let's see how to solve this problem.
I believe that everyone often uses interception of strings in their own programs, but often encounters the problem of garbled characters when intercepting Chinese strings. It is very troublesome. Next, we will introduce two methods to prevent garbled characters when intercepting Chinese strings.
First of all, a function written by yourself is convenient to use.
Use this function to intercept and there will be no garbled characters.
/** * 支持中文字符串截取 */ function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true){ switch($charset){ case 'utf-8':$char_len=3;break; case 'UTF8':$char_len=3;break; default:$char_len=2; } //小于指定长度,直接返回 if(strlen($str)<=($length*$char_len)){ return $str; } if(function_exists("mb_substr")){ $slice= mb_substr($str, $start, $length, $charset); }else if(function_exists('iconv_substr')){ $slice=iconv_substr($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); $slice = join("",array_slice($match[0], $start, $length)); } if($suffix) return $slice; return $slice; }
The second is a built-in function in PHP, the mb_substr function
Specifies the encoding format of the string to be intercepted , can effectively prevent garbled characters.
Description
string mb_substr ( string $str , int $start [, int $length [, string $encoding ]] ) <?php function substr_unicode($str, $s, $l = null) { return join("", array_slice( preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY), $s, $l)); } $str = "Büyük"; $s = 0; // start from "0" (nth) char $l = 3; // get "3" chars echo substr($str, $s, $l) ."\n"; echo mb_substr($str, $s, $l) ."\n"; echo substr_unicode($str, $s, $l); ?>
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