我的PHP不是从MySql中获取数据

I am creating a Login form that captures the values so I can use throughout the session when the user gets pass the regular Login page. I have input in MySQL as follows:

user_id | username | password | firstname | lastname | email | website | active | date_added

I created a function to capture data but it doesn't return anything. Can anyone help me with this?

Here is what the code looks like:

 function user_input($user_id) {
 $input = array();
 $user_id = (int) $user_id;

 $func_num_args = func_num_args();
 $func_get_args = func_get_args();

 if ($func_num_args > 1) {
 unset($func_get_args[0]);

 $fields = ' ` ' . implode('`, ` ', $func_get_args) . ' `';


 $query = mysql_query("SELECT '$fields' FROM Login WHERE user_id = '$user_id' ");
 $input = mysql_fetch_assoc($query);


 print_r($input);
 }
 }

 private function user_input($user_id) {

 private $input = array();
 //$user_id = (int) $user_id; //This line may effect your security 

if(isset($input)){

 $func_num_args = func_num_args();
 $func_get_args = func_get_args();

$query = "SELECT ";
for($i = 0 ; $i <=  $func_num_args; $i++){

     if($i==($func_num_args-1))
     {
         $query =$query .$func_get_args[$i];
     }
     else
     {
         $query =$query .$func_get_args[$i].",";
     }

    }
    $query = $query . " FROM Login WHERE `user_id` =" . $user_id ;

   $rs = mysql_query($query);

    while ($getRow = Mysql_fetch_array($rs)){
       self::$input = $getRow;
    }
 }
    return self::$input ; // this will be returning an array of result set 


  }

Change this -

$query = mysql_query("SELECT $fields FROM Login WHERE `user_id` = $user_id ");

Since a variable inside the double quotes echoes it. If you are using a string in where clause then you have to make it like this '".$xyz['name']."'. If its a simple integer like user_id, you can avoid writing in double or single quotes.`

$fields = ' ` ' . implode('`, ` ', $func_get_args) . ' `';

this then makes you fields

` one `, ` two `

This should be

$fields = '`' . implode('`, `', $func_get_args) . '`';

ALSO

You do not need to put '' around this

'`one`, `two`' < -WRONG

This is correct:

 $query = mysql_query("SELECT $fields FROM Login WHERE user_id = '$user_id' ");

Also LEARN PDO!!!