Tips for intercepting Chinese string functions in PHP

This article mainly introduces the function of intercepting Chinese strings in PHP. It analyzes PHP's techniques for Chinese string operations with examples. Pay attention to the conversion problem between utf-8 and gb2312 encoding. It has certain reference value. Friends in need can refer to it. Next

The example in this article describes the PHP interception Chinese string function. The specific implementation method is as follows:

The code is as follows:

<?php
//中文字符串截取
function substr_zh($string,$sublen,$start=0,$code=&#39;UTF-8&#39;){
 if($code==&#39;UTF-8&#39;){
  $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";
  preg_match_all($pa,$string,$t_string);
  if(count($t_string[0])-$start > $sublen){
   return join(&#39;&#39;,array_slice($t_string[0],$start,$sublen))."...";
   //array_slice()在数组中根据条件取出一段值，参数(数组,开始位置,[长度])
  }else{
   return join(&#39;&#39;,array_slice($t_string[0],$start,$sublen));
  }
 }else{
  $start = $start*2;
  $sublen = $sublen*2;
  $strlen = strlen($string);
  $tmpstr = &#39;&#39;;
  for($i=0;$i<$strlen;$i++){
   if($i>$start && $i<($start+$sublen)){
    if(ord(substr($string,$i,1))>129){
    //ord():返回字符串第一个字符的ASCII值
    //substr():返回字符串的一部分
     $tmpstr .= substr($string,$i,2);
    }else{
     $tmpstr .= substr($string,$i,1);
    }
   }
   if(ord(substr($string,$i,1))>129){
    $i++;
   }
   if(strlen($tmpstr)<$strlen){
    $tmpstr .= "...";
   }
  }
  return $tmpstr;
 }
}
$string ="顶置车顶起困境檲上盯协押畏奇才趄肯困楞右脚可爱有";
echo substr_zh($string,10,0,&#39;gb2312&#39;);
?>

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