php code - trying to loop array - php

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.

Answer 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>';
}

Answer 2

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