A relatively complete PHP character extraction function_PHP tutorial

I have used several character-retrieving functions such as mb_substr, but they are not very easy to use. This one is better.

[php]
/**
* Truncate functions to prevent garbled characters
*
*
​*/
function z_substr($sourcestr='',$i=0,$cutlength=150,$endstr='')
{
$str_length=strlen($sourcestr);//Number of bytes of string
while (($n<$cutlength) and ($i<=$str_length))
{ 
          $temp_str=substr($sourcestr,$i,1);                                              $ascnum=Ord($temp_str);//ascii code                                                                                    If ($ascnum>=224)
                                                                                       $returnstr=$returnstr.substr($sourcestr,$i,3);
                      $i=$i+3;                                                                                                       }elseif ($ascnum>=192)  
                                                                                       $returnstr=$returnstr.substr($sourcestr,$i,2);
                      $i=$i+2;                                                                                                        }else 
                                                                                       $returnstr=$returnstr.substr($sourcestr,$i,1);
                $i=$i+1;                                                                  $n=$n+0.5;                                                                                    }  
If($i<$str_length)$returnstr.=$endstr;
Return $returnstr;
}




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I have used several character-retrieving functions such as mb_substr, but they are not very easy to use. This one is better. [php] /*** Truncate functions to prevent garbled characters * **/ function z_substr($sourcestr=,$i=...