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Detailed explanation of php substr() function processing in Chinese

怪我咯

Release： 2023-03-14 07:00:01

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substr()Function can obtain the specified length substring of string, but when encountering Chinese, garbled characters may be generated at the end of the new string , the following function converts a string longer than $len to end with "..." and removes garbled characters.

用法：$new = getsubstring($old,20); 

function getsubstring($str,$len) 
{ 
    for($i = 0;$i <$end;$i++) 
    { 
        if ($i >=0 AND $i <$end) 
        { 
            if(ord(substr($str,$i,1)) > 0xa1)  
                $result_str.=substr($str,$i,2); 
            else 
                $result_str.=substr($str,$i,1); 
        } 
        if(ord(substr($str,$i,1)) > 0xa1) 
            $i++; 
    } 
    if(strlen($str)<=$end) 
        return $result_str; 
    else 
        return $result_str."..."; 
}

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