array returns error undefined index in php

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

var_dump($rating); --- If php says there is no item 4 - then there is not. Check once again. — zerkms
– zerkms, Commented Mar 8, 2011 at 6:06
Here is what the var_dump returned:it does have index 4: array(11) { [3]=> string(3) "5.1" [4]=> string(1) "6" [5]=> string(3) "5.2" [6]=> string(1) "5" [8]=> string(1) "5" [9]=> string(1) "5" [10]=> string(1) "5" [11]=> string(1) "4" [12]=> string(3) "3.6" [13]=> string(1) "5" [14]=> string(3) "5.1" } — shazia
– shazia, Commented Mar 8, 2011 at 6:09
Just checking if you uncomment your assignment to $write and make it like this: $write="4"; Does it still print 6? — anubhava
– anubhava, Commented Mar 8, 2011 at 6:11

Stephen · Accepted Answer · 2011-03-08 06:17:55Z

2

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.

answered Mar 8, 2011 at 6:17

Stephen

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Comments

brian_d · Accepted Answer · 2011-03-08 06:10:32Z

1

Either $writers[$i] is undefined when $i = 4, or $rating[$write] is undefined when $write = 4. It will be whichever one is on line 232 corresponding to your error message.

Use if(isset($writers[$i])) to prevent the error.

Edit From your comment, I'd say it is $rating[4] that is undefined.

answered Mar 8, 2011 at 6:10

brian_d

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Comments

Gaurav · Accepted Answer · 2011-03-08 06:20:06Z

0

foreach($writers[$i] as $write)
      {
      echo "writer: $write  -  rating: ";
      print_r($rating);
//$write=4;
      echo "<br>". $rating[trim($write)] ; // use trim so that it will replace " 4" to "4"

}

answered Mar 8, 2011 at 6:20

Gaurav

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Comments

FraserK · Accepted Answer · 2011-03-08 06:07:09Z

-1

foreach($writers as $write){
   //code here
}

Is how it should be written :)

answered Mar 8, 2011 at 6:07

FraserK

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4 Comments

shazia Over a year ago

$writers is a multidimentional array

Russell Dias Over a year ago

OPs foreach, I'm assuming is nested within another loop.

shazia Over a year ago

@Russel Dias yes it is a nested

FraserK Over a year ago

Forgive me, i assumed that it was not nested.

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