What are the methods to intercept strings in thinkphp5? (implemented by two methods)

The content of this article is about the introduction (code) of two methods of intercepting strings in thinkphp5. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

In the public common.php

Method 1

//字符串截取
function cut_str($sourcestr,$cutlength)  
{  
   $returnstr='';  
   $i=0;  
   $n=0;  
   $str_length=strlen($sourcestr);//字符串的字节数  
   while (($n<$cutlength) and ($i<=$str_length))  
   {  
      $temp_str=substr($sourcestr,$i,1);  
      $ascnum=Ord($temp_str);//得到字符串中第$i位字符的ascii码  
      if ($ascnum>=224)    //如果ASCII位高与224，  
      {  
    $returnstr=$returnstr.substr($sourcestr,$i,3); //根据UTF-8编码规范，将3个连续的字符计为单个字符          
         $i=$i+3;            //实际Byte计为3  
         $n++;            //字串长度计1  
      }  
      elseif ($ascnum>=192) //如果ASCII位高与192，  
      {  
         $returnstr=$returnstr.substr($sourcestr,$i,2); //根据UTF-8编码规范，将2个连续的字符计为单个字符  
         $i=$i+2;            //实际Byte计为2  
         $n++;            //字串长度计1  
      }  
      elseif ($ascnum>=65 && $ascnum<=90) //如果是大写字母，  
      {  
         $returnstr=$returnstr.substr($sourcestr,$i,1);  
         $i=$i+1;            //实际的Byte数仍计1个  
         $n++;            //但考虑整体美观，大写字母计成一个高位字符  
      }  
      else                //其他情况下，包括小写字母和半角标点符号，  
      {  
         $returnstr=$returnstr.substr($sourcestr,$i,1);  
         $i=$i+1;            //实际的Byte数计1个  
         $n=$n+0.5;        //小写字母和半角标点等与半个高位字符宽...  
      }  
   }  
         if ($str_length>$i){  
          $returnstr = $returnstr . "...";//超过长度时在尾处加上省略号  
      }  
    return $returnstr;  
}

Method 2:

//字符串截取并且超出显示省略号
function subtext($text, $length)
{
if(mb_strlen($text, ‘utf8’) > $length)
return mb_substr($text,0,$length,’utf8′).’ …’;
return $text;
}

When called in the template:

{$tops.title | subtext=18}

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