1             $str1="是你"; 2             $strA = trim($str1); 3             $lenA = strlen($strA); 4             $lenB = mb_strlen($strA,"utf-8"); 5             if($lenA===$lenB){ 6                 echo "英文"; 7             }else{ 8                 if($lenA % $lenB == 0){ 9                     echo "中文"; 10                   }else{11                     echo  "中英";12                   }13             }