php code - trying to loop array

Question

I am noticing some strange behavior while looping through some data. I'm sure it's something simple, but I can't seem to be able to find the bug. I have the following logic:

            <?php
            print 'dumping data : <BR>';
            var_dump($portvlan);
            print '<BR>';
            print 'looping through data: <BR>';
                foreach ($portvlan as $vlandetail){
                    echo 'Vlanid: '.$vlandetail['VlanId'].'<BR>';
                    echo 'Name: '.$vlandetail['Name'].'<BR>';
                    echo 'Mode: '.$vlandetail['Mode'].'<BR>';
                }
            ?>

This is the output that I'm getting:

dumping data :
array(3) { ["VlanId"]=> string(2) "33" ["Name"]=> string(6) "USR_33" ["Mode"]=> string(6) "Access" }
looping through data:
Vlanid: 3
Name: 3
Mode: 3
Vlanid: U
Name: U
Mode: U
Vlanid: A
Name: A
Mode: A

What I was expecting was to see it print a row with 3 cells, with the following values: 33, USR_33, Access.

Can you tell me where I'm going wrong? Thanks.

EDIT 1

This logic works fine when the $portvlan array has more than one entry. For example, on another set of data, the var_dump gives this result:

array(6) { [0]=> array(3) { ["VlanId"]=> string(1) "1" ["Name"]=> string(1) "1" ["Mode"]=> string(5) "Trunk" } [1]=> array(3) { ["VlanId"]=> int(2) ["Name"]=> int(2) ["Mode"]=> string(5) "Trunk" } [2]=> array(3) { ["VlanId"]=> int(3) ["Name"]=> int(3) ["Mode"]=> string(5) "Trunk" } [3]=> array(3) { ["VlanId"]=> int(4) ["Name"]=> int(4) ["Mode"]=> string(5) "Trunk" } [4]=> array(3) { ["VlanId"]=> int(5) ["Name"]=> int(5) ["Mode"]=> string(5) "Trunk" } [5]=> array(3) { ["VlanId"]=> string(2) "33" ["Name"]=> string(2) "33" ["Mode"]=> string(5) "Trunk" } }

And the loop logic works fine.

Are you intending for $portvlan to be an array of vlans? If so, then your data should be an array of arrays, i.e., array(array("VlanID" => "33", "Name" => "USR_33", "Mode" => "Access")). How are you retrieving the source data? — mellamokb
– mellamokb, Commented Jan 23, 2013 at 0:57

Joseph Silber · Accepted Answer · 2013-01-23 00:54:27Z

1

$vlandetail will be populated with a different item from the array on every iteration of the loop. You shouldn't be treating $vlandetail as an array. Just use it directly.

To get the key name of the array entry, you have to change the loop structure to this:

foreach ($portvlan as $key => $vlandetail) {
     echo $key . ': ' . $vlandetail . '<br>';
}

answered Jan 23, 2013 at 0:54

Joseph Silber

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2 Comments

dot Over a year ago

the code only seems to be failing when i only have one record in the $portvlan. If I have multiple records, it loops through fine with the current logic. ?

Žan Kusterle Over a year ago

Then the problem is probably in the code where you are adding data in the portvlan array.

nevermind · Accepted Answer · 2013-01-23 01:35:46Z

0

How you get your $portvlan?

If you can know is $portvlan is not an array of $vlandetail, you can simply do this,

$portvlan = array($portvlan);
// start loop

Or you can do this before you loop it, to make sure $portvlan is a numerical array formed by $vlandetail

$portvlan = (isset($portvlan[0]))?$portvlan:array($portvlan);
// start loop

edited Jan 23, 2013 at 1:35

answered Jan 23, 2013 at 1:28

nevermind

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