关于array_diff函数的问题

Question

把兩個txt轉為base64，再看看是否相同。

Answer 1

private function CheckFileType($array){
    $type="";
    foreach($this->filetypearray as $name=>$value){
        $ar=array_diff($array,$value);
         if(empty($ar)){
            $type=$name;
        }
       }
    return $type;
  }private   $filetypearray=array(
                            'downloadfile'=>array('order-id','order-item-id','purchase-date','payments-date','buyer-email',
                                                  'buyer-name','buyer-phone-number','sku','product-name','quantity-purchased','currency','item-price',
                                                  'item-tax','shipping-price','shipping-tax','ship-service-level','recipient-name','ship-address-1',
                                                  'ship-address-2','ship-address-3','ship-city','ship-state','ship-postal-code','ship-country',
                                                  'ship-phone-number','delivery-start-date','delivery-end-date','delivery-time-zone',"delivery-Instructions ") 
  );
 $order['28']='('.base64_encode($more[28]).')';
 $order['29']='('.base64_encode($this->filetypearray['downloadfile'][28]).')';[28] => (ZGVsaXZlcnktSW5zdHJ1Y3Rpb25zDQ==)
[29] => (ZGVsaXZlcnktSW5zdHJ1Y3Rpb25zIA==)
两个字段的base64结果，最后部分不一样

Answer 2

那个DQ==是什么？？我不加空格编码就是ZGVsaXZlcnktSW5zdHJ1Y3Rpb25z

Answer 3

base64 编码的：
DQ== 是回车符 0x0d （chr(13)）
IA== 是空格符 0x20 （chr(32)）一般情况下首尾的空白字符是可忽略的，所以宜 trim 一下
$ar = array_diff(array_map('trim', $array), array_map('trim', $value));