数组在php中返回错误未定义的索引

Question

The index 4 exisits in array rating but i get error...if i undo the comments $write=4 then it works fine.

foreach($writers[$i] as $write)
      {
      echo "writer: $write  -  rating: ";
      print_r($rating);
//$write=4;
      echo "<br>". $rating[$write] ;

}

the above code gives

    writer: 4 
Notice: Undefined index: 4 in D:\wamp\www\shazia\CRM\EffortTrackUpload\admin\cron.php on line 232

The array rating gives:

Array ( [3] => 5.1 [4] => 6 [5] => 5.2 [6] => 5 [8] => 5 [9] => 5 [10] => 5 [11] => 4 [12] => 3.6 [13] => 5 [14] => 5.1 )

can anyone please help me explain what i am doing wrong.

Thanks

Answer 1

As per your comment, the issue is that $write is a string - " 4", but the array index is just an integer 4.

Work out why the 4 is padded with space in the $writers[$i] array, if you are getting the array from elsewhere you could use intval($write) to get the correct value.