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                            exec可以把執行的結果全部返回到$output函數里(數組),$status是執行的狀態 0為成功 1為失敗
systerm不需要提供$output函數，他是直接把結果返回出來，同樣$return_var是執行的狀態碼 0為成功 1為失敗

exec示例:
~~~
$command = "dig @8.8.8.8  $domain  -t mx +short";
 $retval = array();
 exec($command, $retval, $status);
 if ($status == 0) {
   return $retval;
 }
~~~
該函數返回的是按行的數組：

Array  
(  
　　\[0\] => 5 mx4.hotmail.com.  
　　\[1\] => 5 mx1.hotmail.com.  
　　\[2\] => 5 mx2.hotmail.com.  
　　\[3\] => 5 mx3.hotmail.com.  
)
system示例:
~~~
$command = "dig @8.8.8.8  $domain  -t mx +short";
  $last_line = system($command, $retval);
  print_r($last_line);
  print_r($retval);
  exit();
~~~
該函數返回：

5 mx3.hotmail.com.  
5 mx4.hotmail.com.  
5 mx1.hotmail.com.  
5 mx2.hotmail.com.  
5 mx2.hotmail.com.0


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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