drxyaox153896 2012-12-18 18:51
浏览 90

关于按位运算符和foreach循环的指导

I'm planning to make a dynamic checkbox form which binds each POST to a specific bitwise value, and adventually counts the total ammount of bitwise numbers. I cant think of any good method. could anyone guide me? 

<html>
<head></head>
<body>
<form method="post" action="test.php"/>
<?php

    $fields = array('writePost','readPost','deletePost','addUser',
                      'deleteUser'); 

    $perms = array(
        'writePost' => 1,
        'readPost' => 2,
        'deletePost' => 4,
        'addUser' => 8,
        'deleteUser' => 16
  );

    $results = array();



     foreach($fields as $field)
     {
          echo "<input type='checkbox' name='".$field."' value='".$field."' />";
          echo "<label for='".$field."'>".$field."</label>";
          echo "<br/>";

     }

 if(isset($_POST['submit']))
 {
     foreach($_POST as $posts)
     {
       $posts = $results;

          //
          $total_key = 0;
          $array_key = 1;

          foreach ($perms as $key)
          {

            if (!$key=='read')
              {
              $array_key = $array_key*2;
              }else{
              $array_key  = $array_key+$total_key;
            }

            foreach ($posts as $perms)
            {

              $array_key = $post;
            }

        }
    }

    var_dump($results);

}

var_dump($fields);

?>
<input type="text" name="name" value="name"/>
<input type="submit" name="submit" value="submit"/>
</form>
</body>
</html>
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1条回答 默认 最新

  • dty47696 2012-12-18 19:22
    关注

    I think you want the values of your inputs to be the number instead of the field name:

    echo "<input type='checkbox' name='nums[]' value='".$perms[$field]."' />";

    After than you will want to start with the highest possible number and go backwards:

    $n = sizeof($perms)-1;
$total = array_sum($_POST['nums']);
for($i=$n;$i>0;$i--)
{
    $pow = pow(2, $i);
    if ($pow > $total)
    {
        //$fields[$i] is checked
        $total-=$pow;
    }
}

    But really, you could just put the checked values into an array and check if they are set in PHP if you want a less confusing way to do it.

    评论

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